Full list of all 38 Toy Story 3 achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Complete all Pict-O-Matic missions
Complete all Toy Camera missions
Complete 1 disc of Pict-O-Matic missions
Purchase every item in the Toy Store
Defeat Mayor Hamm in the Woody's Roundup boss battle
Save Mayor Hamm from the bandits
Explored all the objects on the map
Gather every collectible in the game
Find all the Regular Cards
Finished "Muffin to Fear"
Find all the hidden aliens
Find all the Special Cards
Finished "Trash Thrash"
Collect all of Andy's Memorabilia
Finished the Prison Break without ever tripping an alarm
Finished "Hide-N-Sneak"
Finished "Witch Way Out"
Find all the hidden townspeople
Finished "Fair Play"
Collect all of Zurg's Parts
Achieve gold on all carnival games
Finished "To Infinity and Beyond"
Reach Zurg’s base without losing all your health
Finished "Hold the Phone"
Finished "Loco Motives"
Find all 6 discs of Pict-O-Matic missions
Purchase Lotso's Enchanted Glen
Purchase Zurg's Spaceport
Hit 15 Paratrooper targets
Blow up the dam and expand your town
Purchase Sid's Haunted House
Earn a bronze medal in a vehicle challenge
Earn a gold medal in a vehicle challenge
Earn a silver medal in a vehicle challenge
Buy a toy from the Toy Store
Finish the Woody's Roundup tutorials
Rescue all the orphans on the Train
Collect all the Gold Stars