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