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.
Collect all the Gold Stars
Complete all 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
Complete all Toy Camera missions
Find all 6 discs of Pict-O-Matic missions
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
Collect all of Zurg's Parts
Finished "Fair Play"
Achieve gold on all carnival games
Hit 15 Paratrooper targets
Finished "To Infinity and Beyond"
Reach Zurg’s base without losing all your health
Blow up the dam and expand your town
Finished "Hold the Phone"
Explored all the objects on the map
Purchase Lotso's Enchanted Glen
Complete 1 disc of Pict-O-Matic missions
Purchase Zurg's Spaceport
Purchase Sid's Haunted House
Earn a gold medal in a vehicle challenge
Earn a bronze medal in a vehicle challenge
Earn a silver medal in a vehicle challenge
Finish the Woody's Roundup tutorials
Buy a toy from the Toy Store
Finished "Loco Motives"
Rescue all the orphans on the Train