Here is the full list of all 27 Hide Your Butts achievements.
Clear the wall 1-1 in singleplayer
Clear the wall 1-2 in singleplayer
Clear the wall 1-3 in singleplayer
Clear the wall 1-4 in singleplayer
Clear the wall 1-5 in singleplayer
Clear the wall 1-6 in singleplayer
Clear the wall 1-7 in singleplayer
Clear the wall 1-8 in singleplayer
Clear the wall 1-9 in singleplayer
Clear the wall 2-1 in singleplayer
Clear the wall 2-2 in singleplayer
Clear the wall 2-3 in singleplayer
Clear the wall 2-4 in singleplayer
Clear the wall 2-5 in singleplayer
Clear the wall 2-6 in singleplayer
Clear the wall 2-7 in singleplayer
Clear the wall 2-8 in singleplayer
Clear the wall 2-9 in singleplayer
Clear the wall 2-10 in singleplayer
Clear the wall 3-1 in singleplayer
Clear the wall 3-2 in singleplayer
Clear the wall 3-3 in singleplayer
Clear the wall 3-4 in singleplayer
Clear the wall 3-5 in singleplayer
Clear the wall 3-6 in singleplayer
Clear the wall 3-7 in singleplayer
Clear the wall 3-8 in singleplayer