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