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