Here is the full list of all 14 What's under your blanket !? achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
The Santa no longer interferes
Firemen have not entered the room
Policemen have not entered the room
Defeat all your enemies
The muscled man no longer interferes
he christmas tree nearly falled
The nurse no longer interferes
The grandfather does not disturb
Make the fire
You failed your first battle
Break the bed down
Succeed to make the X5
The cat does not disturb
Parents saw what you were doing