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