Here is the full list of all 20 It Takes Two achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Don't feed the animals! Or do, they're adorable.
Took things a bit too far, didn't you?
Now look who's extinct!
Put on a show and die trying.
The truth was out there all along!
All minigames found!
You did it! CO-LLA-BO-RATION!
You reached a higher state of mind. Or at least some peace and quiet.
Release that tension at the root level.
Scurvy! Ye look smashing, captain!
Again? Keep track of your kids!
Helltower? More like hello-from-up-here-tower!
Breathe some wind into your ocarina, my skyward princess!
Isn't it pretty? That's going on the fridge.
Choo Choo!
Guess it was time to cash out.
Shoot for the stars, literally.
They had no way out.
Self-inflicted paparazzi.
It takes two to… torture.