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!
Don't feed the animals! Or do, they're adorable.
Helltower? More like hello-from-up-here-tower!
Now look who's extinct!
Shoot for the stars, literally.
The truth was out there all along!
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.
Scurvy! Ye look smashing, captain!
Again? Keep track of your kids!
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.
They had no way out.
Self-inflicted paparazzi.
It takes two to… torture.