Here is the full list of all 37 Couch Monsters achievements.
Beat the first chapter.
Beat the second chapter.
Beat the third chapter.
Beat the fourth chapter.
Beat the fifth chapter.
Beat the sixth chapter.
Reach the final couch.
Get waaay up there.
Taunt your puzzle partner, who hasn't reached a couch yet.
Blow a raspberry for 20 seconds straight.
Delete a savegame where all levels were unlocked.
Sit down simultaneously.
Open the hints in grand finale.
Get off early in the elevator.
Beat every level in singleplayer mode.
Beat all levels without dying.
Beat the game in under 60 minutes.
Beat the game in under 30 minutes.
Beat the game in under 15 minutes.
Eat 100 boxes.
Eat 250 boxes.
Throw a box out of the level.
Don't touch the blue box in level 10.
Don't touch the orange box in level 30.
Munch on the same box.
Die by flames.
Die by lightning.
Die by crushing.
Die by spikes.
Die by falling out of the screen.
Discover momentum.
Restart after dying to skip the death jingle.
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Die by a box you just spit out.
Beat level 8 without stopping.
Beat level 9 without stopping.
Beat level 29 without stopping.