Here is the full list of all 46 Scribblenauts Mega Pack achievements worth 1,000 gamerscore.
Change your Avatar in Scribblenauts Unlimited.
Spawn an alternate version of Cyborg.
Spawn an alternate version of Martian Manhunter.
Edit an object or an Avatar in Scribblenauts Unmasked.
Spawn an alternate version of Aquaman.
Edit an object or an Avatar in Scribblenauts Unlimited.
Spawn an alternate version of Flash.
Spawn an alternate version of Batman.
Bring 16 Starites to Lily.
Bring 12 Starites to Lily.
Bring 8 Starites to Lily.
Bring 3 Starites to Lily and unlock the world map.
Get all the Starites in any level.
Bring 24 Starites to Lily.
Bring 30 Starites to Lily.
Bring 40 Starites to Lily.
Bring 50 Starites to Lily.
Bring 60 Starites to Lily.
Get all object Shards in the Vehicle category.
Get all object Shards in the Clothes category.
Get all object Shards in the Food category.
Get all object Shards in the Weapon category.
Get all object Shards in the Music category.
Get all object Shards in the Living category.
Get all object Shards in the Tech category.
Get all object Shards in the Misc category.
Get all 217 object Shards!
Help all 40 of Maxwell's brothers.
Get all 112 Starites in Scribblenauts Unlimited!
Unlock your first costume.
Unlock all costumes!
Complete 400 heroic feats.
Get 3000 amount of Gotham reputation.
Get 3000 amount of Justice League reputation.
Get 3000 amount of Metropolis reputation.
Complete Aquaman's origin mission.
Complete Flash's origin mission.
Complete Batman's origin mission.
Complete Wonder Woman's origin mission.
Complete Green Lantern's origin mission.
Complete Superman's origin mission.
Spawn an alternate version of Green Lantern.
Spawn an alternate version of Superman.
Spawn an alternate version of Wonder Woman.
Spawn 150 different Green Lanterns.
Complete the final mission in Scribblenauts Unmasked!