Here is the full list of all 26 Re:|THM - there are once upon a time achievements.
Complete the tutorial.
Defeat for the first time in a rhythm game.
Clear the battle without making a single mistake.
Clear the battle without using the Time Reverse.
Save my progress at the sacred fire.
Collect all music.
Enter the Club
Arrive at the truth.
Back to the beginning of the story.
Listen to Clip's music.
Examine the piano repeatedly.
Defeat the Bandmanster.
Defeat the ForestGuardian.
Defeat the DJ.
Defeat the Choby.
DESTINY
Steam Heart!
GrandSky
BigGiant
BROTHER
PUNCHDRUNK
LierMayor
TopCaste
KeepOut
CLASSIFIED
Poison