Here is the full list of all 22 The Peanuts Movie: Snoopy's Grand Adventure achievements worth 1,000 gamerscore.
Finish a Level
Rescue all the Kids
Unlock the Beagle Scout Costume
Unlock the Astronaut Costume
Unlock the Flying Ace Costume
Complete all Peppermint Jungle levels
Complete all Temple of Bunnies levels
Complete all Lunar Surface levels
Complete all Parisian Underground levels
Complete all Melody Chateau levels
Complete all Skies of Paris levels
Collect all Jelly Beans in a single level
Collect all kids objects
Unlock the Masked Marvel Costume
Unlock the Joe Cool Costume
Unlock the Detective Costume
Unlock all Costumes
Hover as normal Snoopy for more than 5 seconds
Jump on three enemies without touching the ground
Break through a wall as the Masked Marvel
Defeat The Mask Boss without being hit
Have a second player activate a Woodstock trigger