Here is the full list of all 31 Rhythm Sprout: Sick Beats & Bad Sweets achievements.
Clear 10 Levels in Turbo Mode.
Clear All Bonus Levels.
Be very interested in Sugar Daddy's story.
Your love of trap doors knows no bounds.
Finish the Side Story.
Defeat Mrs. Chili.
Defeat The Power Peppers.
Die several times in a row.
Hit 20 Trap Notes in one level.
Clear 5 Levels in Random Mode.
Clear 5 Levels in Mirror Mode.
Finish the Main Story.
Get 100 Stars.
Wear an unlockable skin for multiple levels.
Defeat K-FLOW.
"Defeat" King Sugar Daddy.
Defeat Candy Mama.
Listen to the same loop over and over again.
Get 50 Stars.
Defeat Count Arelle.
Fall through Count Arelle's trap door.
Get your first CD.
Cleared the first level.
Got all achievements in Rhythm Sprout!
Get 10 CDs.
Get 25 CDs.
Get one of the Target Scores in any level (no more, no less).
Get to the finish line with every unlockable skin.
Rewatched a cutscene multiple times.
Answered YES on every question at least once.
Answered NO on every question at least once.