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