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.
Clear 5 Levels in Random Mode.
Clear 5 Levels in Mirror Mode.
Be very interested in Sugar Daddy's story.
Clear 10 Levels in Turbo Mode.
Hit 20 Trap Notes in one level.
Rewatched a cutscene multiple times.
Clear All Bonus Levels.
Get your first CD.
Finish the Side Story.
Defeat Mrs. Chili.
Defeat The Power Peppers.
Die several times in a row.
Get 100 Stars.
Your love of trap doors knows no bounds.
Finish the Main Story.
"Defeat" King Sugar Daddy.
Defeat K-FLOW.
Wear an unlockable skin for multiple levels.
Defeat Candy Mama.
Get 50 Stars.
Listen to the same loop over and over again.
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.
Answered YES on every question at least once.
Answered NO on every question at least once.