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