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