Here is the full list of all 10 Papo & Yo achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Collect all hats.
Finish the game.
Play through the game without reading any hint boxes.
Run away from Lula for 20 seconds.
Revive Lula.
Give Monster a rotten fruit.
Splat a frog right on the bullseye.
Double-jump with Lula to cross the first large gap.
Splat 21 frogs at once in the main menu.
Build and cross the houses bridge with only 3 houses.