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