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