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.
Defeated Calypso.
Completed all unlockable levels.
Defeated Cobos.
Gathered every Coin in the game.
Found all secret teleports.
Unlocked all skills.
Defeated Octobos.
Defeated Robos.
Completed a level without collecting any ambers.
Completed one unlockable level.
Defeated Frobos.
Unlocked a new skill.
Made 4 enemies dance at once.
Completed a level without losing a heart.
Hit 3 enemies with one dash.
Found a secret teleport.
Completed a level in co-op.
Gathered all Coins on one level.
Collected more than 100% of ambers in any level.