Here is the full list of all 32 The Metronomicon: Slay The Dance Floor achievements.
Beat the final challenge's omega boss.
Defeat every arena challenge.
Defeat every arena challenge on hard.
Survive every song in Story Mode.
Survive every song in Story Mode on Hard.
Succeed in every single sidequest.
Deal at least 5000 hp damage in one strike as Gwen.
Kill five enemies in a row with a single attack.
Save the world of Koras from Dancemageddon.
Unlock Sara's laboratory.
Make five arena challenges your chump
Decompile a fearsome Dance-o-bot.
Conquer one challenge in the school arena.
End the dancing of a great Candy Dragon.
Dethrone the Wraith King in the Haunted Kingdom.
Succeed in beating five sidequests.
Perform a perfect meteor attack counter.
Survive your first 10 songs in Story Mode.
Destroy the Speyeder of the Wild Forest.
Attain a 300 note streak.
Unlock your first bonus song.
Perform a perfect Solo-Lane Team Attack.
Succeed in your first story sidequest.
Perform your first upgrade to the school.
Attain a 100 note streak.
Purchase every ultimate weapon.
Survive a story song without killing an enemy.
Survive a story song without healing any party member.
Apply six buffs to one hero at the same time.
Beat a fifty song playlist without ever pausing.