Here is the full list of all 46 Disney Epic Mickey 2: The Power of Two achievements worth 1,000 gamerscore.
Collected every Costume
Finished Dark Beauty Castle with two players
Painted every star and comet in Yen Sid's Lab
Matched Seth's flowers to OsTown's statue
Found 88 Collectible Pins
Collected every 2D Film Reel
Defeated the Mad Doctor's new ride
Rescued all the gremlins
Destroyed 100 enemies
Got all three of Metairie's pictures
Dealt with all the Guardian Siphons
Got all Adelle's photos from the official Picture Spots
Befriended 100 enemies
Got through Ventureland's construction area
Ignored Daisy AND Smee's suggestions
Defeated Prescott's mechanical creation
Chased Prescott through the Floatyard
Played through every D.E.C.
Photographed every enemy
Scouted a path through Fort Wasteland
Destroyed 50 enemies
Dealt with all 3 dioramas
Got through Blot Alley by any means
Befriended 50 enemies
Revealed every knothole surprise
Opened the way to Blot Alley
Built both statues in OsTown
Entered Angel Falls, exited Devil Falls
Defeated the Blotworx Dragon
Braved Disney Gulch
Found a way through the Rainbow Caverns
Restarted the Rainbow Falls Substation
Awakened a Spirit
Reprogrammed a Beetleworx
Solved OsTown's Thinner problem
Navigated both halves of Mean Street
Changed costumes for the first time
Mickey revived Oswald while playing co-op
Finished Yen Sid's Lab
Acquired a Collectible Pin for the first time
Befriend the Blotworx and help Petetronic
Collect 176 Collectible Pins
Shutter all four train stations
Finish all quests
Complete a race in Autotopia
Awaken every Spirit