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.
Breathe some wind into your ocarina, my skyward princess!
Scurvy! Ye look smashing, captain!
Now look who's extinct!
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.
Don't feed the animals! Or do, they're adorable.
Took things a bit too far, didn't you?
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!
Guess it was time to cash out.
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.
It takes two to… torture.