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