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