Here is the full list of all 26 CheeseCube Demo achievements.
Get 50 meters high
Get stuck for 5 seconds
Restart 100 times
Die 100 times
Unlock your first skin
Fall 10 times off the platform
Hit a gray block 50 times
Hit a gray block 500 times
Go as low as possible
Hit 5 bounce platforms in one run
Make your first jump
Complete the tutorial
Fail in the first second
Unlock 9 skins
Play the game for 30 minutes (pause and menu do not count)
Complete a level over 5 minutes
Go over the finish in level 13
Touch 500 sand blocks
Complete all the skins
Hit a green boi, water and boost
Hit a snowman
Hit a boat
Get all the stars
Find the secret in level 21
Hit the collectable and the finish in one run on every level
Get 10 stars