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.
You did it! CO-LLA-BO-RATION!
Scurvy! Ye look smashing, captain!
Again? Keep track of your kids!
Helltower? More like hello-from-up-here-tower!
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.
All minigames found!
Shoot for the stars, literally.
Now look who's extinct!
Isn't it pretty? That's going on the fridge.
Choo Choo!
Breathe some wind into your ocarina, my skyward princess!
Took things a bit too far, didn't you?
Don't feed the animals! Or do, they're adorable.
Release that tension at the root level.
You reached a higher state of mind. Or at least some peace and quiet.