Here is the full list of all 15 Disney Infinity 3.0: Play Without Limits achievements.
Complete 75 Feats
Complete 50 Feats
Throw a party for your friends in one of the designated Sidekick Rooms
Play all Toy Box Adventures
Complete 25 Feats
Harvest 100 plants
Feed Sidekick 50 times
Complete all Toy Box and INterior tutorials
Play a downloaded UGC in the theater (Steam, Single Player Only)
Reveal all the terrain in the Toy Box Hub
Earn 10 Toy Presents in the Toy Box Hub
Build a 20-room INterior
Complete 5 Feats
Earn 5 Sidekicks
Save a Toy Box