Here is the full list of all 32 The Metronomicon: Slay The Dance Floor achievements.
Unlock Sara's laboratory.
Succeed in beating five sidequests.
Save the world of Koras from Dancemageddon.
Survive a story song without healing any party member.
Decompile a fearsome Dance-o-bot.
Attain a 300 note streak.
Conquer one challenge in the school arena.
End the dancing of a great Candy Dragon.
Destroy the Speyeder of the Wild Forest.
Dethrone the Wraith King in the Haunted Kingdom.
Succeed in your first story sidequest.
Unlock your first bonus song.
Survive your first 10 songs in Story Mode.
Perform your first upgrade to the school.
Attain a 100 note streak.
Perform a perfect Solo-Lane Team Attack.
Make five arena challenges your chump
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.
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.
Perform a perfect meteor attack counter.
Kill five enemies in a row with a single attack.
Beat a fifty song playlist without ever pausing.