Here is the full list of all 20 Mush achievements worth 200 gamerscore. It takes around 3-4 hours to unlock all of the achievements on Windows Phone.
Complete the first level.
Use happy emotion for the first time.
Use the sad emotion for the first time.
Use the confused emotion for the first time.
Use the angry emotion for the first time.
Complete all the happy levels.
Complete all the sad levels.
Complete all the confused levels.
Complete all the angry levels.
Complete all the levels.
Change emotions 150 times.
Complete a level in less than five minutes.
Collect your first 10 minimotes.
Complete any level collecting all minimotes.
Complete a level without collecting 10 or more minimotes.
Complete a sad level collecting all happy minimotes.
Collide with electricity three times in a row.
Change to the confused state three times in quick succession.
Smash 65 rocks.
Collect all minimotes in the game and complete the current level.