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