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