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