Here is the full list of all 19 Juju achievements.
Complete all unlockable levels.
Complete one unlockable level.
Make 4 enemies dance at once.
Hit 3 enemies with one dash.
Defeat Calypso.
Defeat Cobos and collect his key part.
Gather every Coin in the game.
Find all secret teleports.
Complete any level without collecting an amber.
Unlock all skills.
Defeat Octobos and collect his key part.
Defeat Robos and collect his key part.
Defeat Frobos and collect his key part.
Unlock a new skill.
Complete a level in co-op.
Find a secret teleport.
Gather all Coins on one level.
Collect more than 100% of ambers in any level.
Complete any level without losing a heart.