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.
Firemen have not entered the room
Policemen have not entered the room
Defeat all your enemies
The Santa no longer interferes
The nurse no longer interferes
The grandfather does not disturb
You failed your first battle
Break the bed down
Succeed to make the X5
The cat does not disturb
Make the fire
Parents saw what you were doing
The muscled man no longer interferes
he christmas tree nearly falled