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.
Play through the game without reading any hint boxes.
Finish the game.
Revive Lula.
Give Monster a rotten fruit.
Splat a frog right on the bullseye.
Run away from Lula for 20 seconds.
Build and cross the houses bridge with only 3 houses.
Splat 21 frogs at once in the main menu.
Double-jump with Lula to cross the first large gap.