2010 season Astbury was drafted to with the club's third selection and the 35th pick overall in the
2009 AFL national draft. Astbury played his first match against AFL opponents in a
pre-season game against in Launceston in February 2010. He then spent the early part of the regular season playing at reserves level with Richmond's
VFL affiliate . Astbury's AFL debut came in round 4, in a 55-point loss to . Astbury played three more matches at senior level but failed to kick a goal in any. After playing 13 consecutive matches Astbury had his season ended early, sent for hip surgery following round 21's loss to . He first wore it in pre-season matches in February 2011 before being selected to play at senior level in round 1's season-opening match against . The resulting surgery revealed extensive damage to the
medial collateral ligament too. Efforts to repair the knee would keep him sidelined and unable to play another AFL match that season, having only featured in five to that point. He kicked a goal in that match and again the next week when he played in the club's final match of the season. Before the start of the season he sustained a foot injury however, and did not play in either of the first two weeks of the season. He earned his first match of the season at senior level a fortnight later, playing against at the MCG. He rehabilitated the injury at VFL level before earning another AFL match in round 19. In that match Astbury played a key shut down role on forward
Jack Gunston and earned himself a further two matches at senior level. In round 4 he impressed again, this time keeping forward
Travis Cloke goalless. Yet another starring performance came in round 6 where he kept 's
Jarryd Roughead to one goal and was named by
AFL Media as one of Richmond's best players that day. By the conclusion of round 8 it was clear Astbury was having the best season of his career to-date, a fact later confirmed when the club's best and fairest count revealed he was Richmond's second highest vote polling player to that point of the year. More injury troubles would await him however when in round 9 Astbury suffered another patella dislocation (this time in his left knee) while attempting to tackle midfielder
Jack Viney in the third quarter of that match. Though he reset the dislocation himself while still on the field, he would again need surgery to fully repair the damage.
2015 season A full pre-season training program awaited Astbury in the lead-up to the 2015 season. Despite this, and though initially selected to play, Astbury withdrew from a pre-season match in February with knee soreness. Just days before he was due to line up in his club's round 1 side, Astbury was stung by a stingray while wading at a
Port Melbourne beach. Surgery was required to remove the barb that caused minor damage to his left foot and ankle. He missed the first two weeks of the season as a result of the injury, before making a return to AFL football in round 3. Astbury remained in the senior side for a further three matches including in round 5, where he was moved into the Richmond forward-line in the match's third quarter and kicked his first goal since 2012. Astbury played a dual role as defender and forward, doing so well as to come under consideration (though ultimately unsuccessful) for AFL selection as a forward in round 15. He was later named as an emergency in round 19 but could not earn final AFL selection again at any point that season. Astbury finished the year only having played four AFL matches, bringing his five-year total to just 24. Media reports suggested he had been offered a four-year deal worth a reported $500,000 per season and the promise of greater playing time at AFL level. Talks progressed so far that Astbury was confirmed to have traveled to Brisbane to meet club officials and complete a medical exam. By the middle of October a deal was reported to be almost complete, but a late period decision by Astbury to remain at Richmond saw him still at the club by the close of the trade deadline.
2016 season Astbury underwent minor hip surgery in the lead-up to the 2016 season, but still managed what the
Herald Sun labelled a "brilliant" pre-season training campaign. With the move of veteran defender
Troy Chaplin to a new forward-line role, Astbury was the natural replacement as a key defender alongside
All-Australian Alex Rance in the Richmond defence. He played that role in the club's first
pre-season match in February but missed a large portion of the game after sustaining ligament damage to his thumb. He was back to full health by late March however, and earned selection to the club's AFL side in round 1. In round 4 Astbury suffered another injury, this time in the form of a rolled ankle that ended his night in the fourth quarter of that match. He did not miss a game as a result of the injury however, instead playing a further two matches at AFL level before being omitted form the club's round 7 side due to poor form. Astbury returned to senior football after three weeks away, recording 11 marks in a win over in the marquee
Dreamtime at the 'G match. In round 15, he recorded a career-best 23 disposals in a match against . Five weeks later he set a new career-best for marks, taking 14 in his club's round 20 win over . By season's end Astbury had played in a total 19 matches, the most of any year of his career to-date. During the off-season Astbury avoid the contract drama of the year previous, having quietly signed a new three-year deal to keep him at Richmond until the end of the 2019 season.
2017 season Across the first two games of the 2017 season Astbury was a serviceable contributor to the Richmond defence. For that performance he earned an honourable mention but ultimately went unselected in
AFL Media's Team of the Week. Astbury led all Richmond players with 12 disposals to half time of round 4's match with
Brisbane, finishing the game with 16 disposals and 11 marks. His form to that point was labelled by the
Herald Sun as "career-best" while Richmond's back-line ranked number one in the league for fewest points conceded. The following week Astbury become a point of discussion concerning umpiring when he was adjudged to have illegally rushed a behind while fumbling the ball in round 5's win over . His performance in round 9 was first-rate, recording an equal game-high four intercept marks as part of 10 total marks that saw him placed 20th in the league in that statistic so far that season. Another starring performance came in round 11 when Astbury restricted 's
Jarrad Waite to a single goal while recording 20 disposals and an equal team high eight intercepts of his own. He was one of six Richmond players recognised in the AFL Coaches Association award rankings for that match, recording 2 of a possible 10 votes. After 11 rounds of the season Astbury ranked sixth in the competition for intercept marks. Eight weeks later he had improved this position, now ranking fourth in the league for average marks, intercept marks and intercept possession while also ranking third for lowest defensive on-on-one loss percentage (20 per cent). In early August the Herald Sun labelled him as a "legitimate star" on the back of his development that season. At the end of the 2017 home and away season Astbury ranked eighth in the league for total marks recorded that season with 150 across his 22 matches. He also ranked equal 19th with his 106 one percenters. September saw Astbury play in the first final of his career, keeping
Tom Hawkins to just one goal in a qualifying final victory over . In the preliminary final that followed, Astbury managed to keep 's
Jonathon Patton to one goal, helping push Richmond to a 36-point victory and their first grand final in 35 years. In the
2017 AFL Grand Final Astbury was given the task of restricting 's
Taylor Walker, which he did by keeping the Crows captain goalless until late in the match when the game was already out of reach. Across the season and finals series Astbury ranked number eighth in the league for intercepts, ninth for marks and 20th for one-percenters in 2017. As part of his premiership success, Astbury was awarded life membership at Richmond.
2018 season in round 13, 2017 Astbury underwent minor shoulder surgery immediately following the end of the 2017 finals series, though still managed to complete a mostly-full training program in the lead-in to the 2018 season. He was back to full health in time for the club's first
pre-season match of 2018, but suffered a head knock and a concussion during the match and played only limited game-time as a result. The effects of the concussion were minimal however as he managed to play in the team's second and final pre-season match in March as well as in the season opening match against later that month. He made amends the following week, earning selection to
AFL Media's Team of the Week for his efforts in Richmond's 13-point victory over . Astbury repeated the accolade in round 4, earning another Team of the Week selection as well as three votes in the
AFL Coaches Association's award for his 20 disposal and six mark game against the . After four rounds Astbury ranked second in the league for most goals conceded to a direct-opponent with 13. In contrast he was placed highly in a number of positive statistics, ranking 12th for intercepts, 17th for marks and 20th for rebound 50s across all players in the league. In round 5 he set a new career-best with seven rebound-50s in a win over . To the mid-point of the season Astbury ranked 13th in the league for intercepts and 17th for total marks. Astbury played his 50th consecutive match in round 12, but he also sustained a significant ankle injury in that loss to . Though he played out the match on that injury, Astbury was forced to miss the following week's match with to rehabilitate the ankle before returning in round 15 against . During that match he was engaged in misconduct against opposition forward
Tom McCartin that saw him attract a $1,500 fine from the AFL's Match Review Officer. Astbury played his 100th career match in round 17, a loss to the at
Spotless Stadium in Sydney. Two weeks later he was lauded by the
ABC and received four Coaches Association Award votes after posting a season-best 21 disposals and a match-high 11 intercepts in Richmond's round 19 win over . Astbury was rested for the round 22 match with due to Achilles soreness but returned to play in the club's final match of the home and away season the following week. In that match he received a fine for engaging in misconduct against player
Fergus Greene. At the conclusion of the regular season Richmond had broken the league record for intercept marks in a season, with Astbury ranked third at Richmond in that statistic. In the club's qualifying final win over , Astbury recorded eight one percenters and was labelled "almost impassable" by
AFL Media despite recording a season-low six disposals. He was the subject of significant media attention in the lead-up to the preliminary final two weeks later, after reports emerged that he contracted the
common cold and was admitted to hospital for an intravenous drip just two days before that match. He was ultimately ruled fit to play in that match against and did so primarily in defence with a later stint in the forward line when Richmond faced a significant half time scoring deficit. Astbury's performance in that shock knock-out loss was labelled by
AFL Media as "lethargic and out of sorts".
2019 season In the 2019 pre-season Astbury was labelled by
AFL Media as one of the league's two most underrated defenders along with teammate
Dylan Grimes, with Astbury being noted for his ability to directly defend opposition key forwards and free his backline group to play a more attacking style. In February and March, Astbury made appearances in each of the club's two
pre-season matches before recording nine disposals in round 1's season-opening match against . The defence struggled under the task in early weeks, conceding 36 goals over a two-week stretch before stabilising with a win over in round 4 in which Astbury contributed eight marks. Astbury suffered an ankle injury in the second quarter of round 6's win over , playing out the match but ultimately being ruled out for the following week's match against the in which Richmond's defence conceded nine contested marks to Bulldogs forward
Aaron Naughton. He returned after just one week out, averaging 16.3 disposals over the next four games to the end of round 11. A minor hamstring injury suffered while training would rule Astbury out for two matches from round 12 until the end of the club's bye, before making his return in round 15. Two weeks later, Astbury signed a new two-year contract extension that would see him tied to the club until the end of the 2021 season. He bettered that the following week, earning four votes in a win over at the
MCG in which he recorded 16 disposals, four rebound-50s and an equal game-high nine intercept possessions. In round 20, Astbury attracted a $2000 fine from the AFL's match review officer for striking 's
Harrison Petty in that win. After nine straight wins to finish the home and away season, Astbury contributed eight marks in a qualifying final victory over the at
The Gabba. That earned the club a home preliminary final against , who in round 12 had beaten an Astbury-less Richmond side by 67 points. Astbury's addition, along with the suspension of Geelong forward
Tom Hawkins provided a key difference, with Richmond winning through to a grand final match up against . To that point, Astbury ranked eight in the league for defensive one-on-one wins, winning 40 per cent of his contests. In the
grand final, Astbury led a Richmond defence that kept the Giants to 25 points, their lowest score in the club's eight-year history and the lowest score by any team in a VFL/AFL grand final since 1960. He kept his various direct opponents disposal-less over the length of the match, including his primary opponent
Jeremy Finlayson, who finished the match with a single disposal, gathered while being covered by one of Astbury's Richmond teammates. After a season that included 22 matches and a second AFL premiership in three seasons, Astbury earned ninth place in the club's best and fairest award.
2020 season Astbury's importance to the Richmond backline was confirmed with the shock off-season retirement of fellow defender
Alex Rance in December 2019. He demonstrated this with strong showings in each of the club's two
pre-season matches in March before contributing 14 disposals in round 1's win over . The match was played under extraordinary conditions, the first of what had been announced would be a shortened 17-round season imposed on the league as a result of the rapid progression of the
coronavirus pandemic into Australia. Due to public health prohibitions on large gatherings, matches that season were to be played without crowds in attendance and with quarter lengths reduced by one fifth in order to reduce the physical load on players who would be expected to play multiple matches with short breaks in the second half of the year owing to the likelihood of an extended break in play that season. Just three days later, the AFL Commission suspended the season after multiple states enforced quarantine conditions on their borders that effectively ruled out the possibility of continuing the season as planned. After an 11-week hiatus, Astbury contributed 14 disposals and six marks in a round 2 draw with when the season resumed in early-June. In a loss to two weeks later, Astbury suffered a
partial dislocation of the
patella bone in his knee. Though he was able to play out the match, scans later revealed damaged cartilage around the knee that would require surgery to correct and that would see him ruled out for an estimated four to five weeks. Astbury moved to the Gold Coast with the main playing group to rehabilitate the injury in early-July, relocating due to a virus outbreak in Melbourne. Astbury progressed ahead of schedule during July and was named by coach Damien Hardwick as likely to return for the club's round 8 match, before complications that week forced him into a slower recovery. He underwent a further arthroscopy in early August, revising out the timetable for his return to at least a further three weeks. He finally returned to match-play in a reserves-grade scrimmage match in mid-September, before earning a recall to AFL level one week later in the club's final match of the regular season. He recorded 14 disposals and a game-high nine intercepts in that round 18 win over , and held his place into the club's finals series campaign. Astbury was similarly impressive in the opening week of the finals, taking seven marks in a qualifying loss to the . The loss would drive Richmond to structural change however, with Astbury assuming the role of relief ruck in the club's follow-up semi-final win over . He fared ably in the match, and reprised the role in a preliminary final win over the following week. Astbury became a three-time premiership player the following week, helping his side to a 31-point victory over in the
grand final. Though he also began that match as a relief ruck, he was most impactful when structural changes mid-match forced him back into defence, where he kept
Tom Hawkins to just one goal.
2021 season Astbury played his first football of 2021 in the club's unofficial pre-season match against in February, before featuring in the club's sole official pre-season match against in early March. He attracted a $2000 fine for an off-the-ball elbow to 's
Lachie Plowman in round 1, during a down performance that included just nine disposals. Astbury played as a defender and the team's second ruck in that match and across the first four rounds of the season, before settling into a much more heavily backline-focused role with only the occasional ruck contest as of round 5. He played an important role in negating
Giants forward
Jesse Hogan in the second half of round 9's win over , but was soon after recognised by AFL statistical partner Campion Data as showing a 15% reduction in ranking points to the previous year, the second biggest drop of any Richmond player to that point of the season. Astbury was an injury omission from the club's round 11 match against , with the club revealing he had been managing persistent Achilles soreness during the opening months of the season and was experiencing an acute flare up that would rule him out from selection. He made his return six weeks later in round 16's loss to the , before playing his 150th AFL match the following week against . Astbury suffered an ankle injury in round 17's win over the which put him in some doubt for the following week, though he was ultimately able to play that match and each of the following four before missing round 22 as a late exclusion with a quad injury. In the days that followed, Astbury announced he would retire at season's end. He returned to fitness to feature in the club's year-ending round 23 draw with , labeled by
The Age as one of his side's best players in the match after a 20-disposal and 13-mark performance in what was his final match. Astbury was later awarded the Francis Bourke Award at the club's best and fairest night, as the player that most embodies the club's key values. In total, Astbury's career spanned 12 years and included 155 AFL games and three AFL premierships. ==Player profile==