Here is the full list of all 17 Koala Kids achievements.
Complete the game in coop. Not Necessary to unlock every item.
Complete the game in coop, unlocking everything.
Complete the game in single player, unlocking everything.
Finish building the house.
Unlock all the flowers.
Complete the game in single player. Not necessary to unlock every item.
Get all the hats.
Unlock all band members.
Collect 8000 total treasure in a world.
Use a water bucket.
Lose 20 treasure on death.
Use a snare trap.
Use a dynamite.
Get the first hat.
Play game for 10 min in one session.
Hide in a bush.
Meet the banker for the first time (At the end of the level).