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