Here is the full list of all 32 Crumble achievements.
Unlock all the skins
Collect all the 21 blobs
Unlock half the skins
Finish any level without using your jump
Make 100 tiny mushrooms fart
Win all the stars of the main levels
Complete all the levels including optional levels
Complete the main levels
Finish the 5th world
Win all the stars
Finish any level in less than 30 seconds
Finish the 4th world
Roll for 10Km
Collect half the blobs
Win all the stars of the optional levels
Finish the 3rd world
Jump 2000 times
Win half the stars
Roll for 5Km
Finish the 2nd world
Jump 1000 times
Get directly hit by a cannonball
Unlock your first skin
Finish any level without using your tongue
Finish the 1st world
Reach maximum top speed
Roll for 1Km
Win your first star
Fall through the fog for the first time
Jump 100 times
Collect your first blob
Leave the orbit in the hub world