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