Here is the full list of all 15 Disney Infinity 3.0 Edition (Windows) achievements worth 1,000 gamerscore.
Complete 75 Feats
Complete 50 Feats
Play all Toy Box Adventures
Complete all Toy Box and INterior tutorials
Complete 25 Feats
Earn 10 Toy Presents in the Toy Box Hub
Feed a Sidekick 50 times
Harvest 100 plants
Throw a party for your friends in one of the designated Sidekick Rooms
Build a 20-room INterior
Reveal all the terrain in the Toy Box Hub
Complete 5 Feats
Play a downloaded UGC in the theater (Xbox Live, Single Player Only)
Earn 5 Sidekicks
Save a Toy Box