The Fermion Add-on for Groove Coaster has 6 achievements.
Play Fermion 20 times
Play Fermion and clear all of SIMPLE, NORMAL and HARD
Play Fermion and get A Rank in SIMPLE, NORMAL and HARD
Play Fermion and get S Rank in SIMPLE, NORMAL and HARD
Play Fermion and get S+ Rank in SIMPLE, NORMAL and HARD
Play Fermion and get S++ Rank in SIMPLE, NORMAL and HARD