The And Then There Were None Add-on for Groove Coaster has 6 achievements.
Play And Then There Were None 20 times
Play And Then There Were None and clear all of SIMPLE, NORMAL and HARD
Play And Then There Were None and get A Rank in SIMPLE, NORMAL and HARD
Play And Then There Were None and get S Rank in SIMPLE, NORMAL and HARD
Play And Then There Were None and get S+ Rank in SIMPLE, NORMAL and HARD
Play And Then There Were None and get S++ Rank in SIMPLE, NORMAL and HARD