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