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