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