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