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.
Achievements they've won
Achievements they've not won
Finish the Woody's Roundup tutorials
Explored all the objects on the map
Rescue all the orphans on the Train
Buy a toy from the Toy Store
Finished "Hold the Phone"
Finished "Loco Motives"
Finished "To Infinity and Beyond"
Finished "Fair Play"
Finished "Witch Way Out"
Finished "Trash Thrash"
Finished "Muffin to Fear"
Gather every collectible in the game
Finished the Prison Break without ever tripping an alarm
Reach Zurg’s base without losing all your health
Achieve gold on all carnival games
Collect all of Zurg's Parts
Collect all of Andy's Memorabilia
Find all the hidden townspeople
Find all the hidden aliens
Find all the Special Cards
Find all the Regular Cards
Blow up the dam and expand your town
Save Mayor Hamm from the bandits
Defeat Mayor Hamm in the Woody's Roundup boss battle
Collect all the Gold Stars
Purchase every item in the Toy Store
Complete 1 disc of Pict-O-Matic missions
Find all 6 discs of Pict-O-Matic missions
Complete all Pict-O-Matic missions
Purchase Sid's Haunted House
Purchase Lotso's Enchanted Glen
Purchase Zurg's Spaceport
Hit 15 Paratrooper targets
Earn a bronze medal in a vehicle challenge
Earn a silver medal in a vehicle challenge
Earn a gold medal in a vehicle challenge
Complete all Toy Camera missions