In 2017, Acha debuted on the senior international circuit.[2] He won a surprise bronze medal in the mixed team event in the second leg of the 2017 Archery World Cup in Antalya, defeating the American team in the third-place match while partnering with Alicia Marín.[2] He also competed in his first World Championships a few months later.
Acha won two bronze medals at the 2018 Mediterranean Games in Tarragona, one as an individual and one as a team.[3] He followed this with another individual bronze at the 2019 European Games in Minsk, which secured Spain's qualification to the 2020 Summer Olympics.[4][5] Due to the COVID-19 pandemic, the only notable event Acha competed at in 2020 was the Indoor World Cup in France, where he placed fifth in the individual event.[6]
In 2021, Acha won two team medals in the Archery World Cup: a gold in the first leg and a silver in the second.[7] He teamed with Miguel Alvariño and Daniel Castro, beating the United States in the final to win their country's first gold medal in history of the event.[8] That summer he competed at the 2021 European Championships. He won a gold medal in the individual event, defeating Galsan Bazarzhapov in the final.[9] He also took home a silver medal partnering with Elia Canales in the mixed team event, ultimately losing to the Russian duo of Aldar Tsybikzhapov and Elena Osipova.[9]
Originally from Burgos, Acha moved to Madrid for his training.[2] He got his start in archery at the age of eight because his older brother was doing it and his uncle was president of a local archery club.[4][12]
