The Night of Knights / Knight of Nights Add-on for Groove Coaster has 10 achievements.
Play Night of Knights 20 times
Play Night of Knights and clear all of SIMPLE, NORMAL and HARD
Play Night of Knights and get A Rank in SIMPLE, NORMAL and HARD
Play Night of Knights and get S Rank in SIMPLE, NORMAL and HARD
Play Night of Knights and get S+ Rank in SIMPLE, NORMAL and HARD
Play Night of Knights and get S++ Rank in SIMPLE, NORMAL and HARD
Play Night of Knights and get A Rank in EXTRA
Play Night of Knights and get S Rank in EXTRA
Play Night of Knights and get S+ Rank in EXTRA
Play Night of Knights and get S++ Rank in EXTRA