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