Here is the full list of all 16 Frozen Mystery achievements.
Reach level 10
Reach level 20
Reach level 30
Reach level 40
Pick up the first crystal
Pick up 50 crystals
Pick up 100 crystals
Melt the cell with a crystal inside of it
Dig a hole
Click on a red slider block
Click on a green slider block
Click on a switch block
Swap connected blocks
Open a portal
Go through a portal
Complete the game