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