In 2018, Grigalashvili won one of the bronze medals in the men's 81 kg event at the
Judo Grand Prix Antalya held in Antalya, Turkey. The following year, Grigalashvili won one of the bronze medals in this event at the
2019 Judo Grand Prix Tbilisi held in Tbilisi, Georgia. In the same year, he won one of the bronze medals in the
men's 81kg event at the
2019 Summer Universiade held in Naples, Italy. In 2020, Grigalashvili won the gold medal in the men's 81 kg event at the
Judo Grand Slam Düsseldorf held in Düsseldorf, Germany. He is also the gold medalist in the
men's 81kg event at the
2020 European Judo Championships held in Prague, Czech Republic. In 2021, Grigalashvili won the gold medal in his event at the
Judo World Masters held in Doha, Qatar. He won the silver medal in the
men's 81kg event at the
2021 World Judo Championships held in Budapest, Hungary. Grigalashvili won the silver medal in his event at the
2022 Judo Grand Slam Paris held in Paris, France. He won the gold medal in the
men's 81kg event at the
2022 European Judo Championships held in Sofia, Bulgaria. At
2024 Summer Olympics, he won silver medal at –81 kg weight class. ==Achievements==