Here is the full list of all 32 The Metronomicon: Slay The Dance Floor achievements.
Save the world of Koras from Dancemageddon.
Kill five enemies in a row with a single attack.
Survive a story song without healing any party member.
Decompile a fearsome Dance-o-bot.
End the dancing of a great Candy Dragon.
Unlock Sara's laboratory.
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.
Perform a perfect meteor attack counter.
Survive your first 10 songs in Story Mode.
Destroy the Speyeder of the Wild Forest.
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.
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.
Purchase every ultimate weapon.
Succeed in every single sidequest.
Attain a 300 note streak.
Survive a story song without killing an enemy.
Apply six buffs to one hero at the same time.
Deal at least 5000 hp damage in one strike as Gwen.
Beat a fifty song playlist without ever pausing.