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