Here is the full list of all 19 JUJU achievements worth 1,000 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox 360.
Completed all unlockable levels.
Gathered every Coin in the game.
Found all secret teleports.
Completed one unlockable level.
Defeated Calypso.
Defeated Cobos.
Unlocked all skills.
Defeated Octobos.
Defeated Robos.
Defeated Frobos.
Completed a level without collecting any ambers.
Completed a level without losing a heart.
Unlocked a new skill.
Made 4 enemies dance at once.
Completed a level in co-op.
Collected more than 100% of ambers in any level.
Hit 3 enemies with one dash.
Found a secret teleport.
Gathered all Coins on one level.