Here is the full list of all 38 Koa and the Five Pirates of Mara achievements.
Pet the dog.
Complete Grant Loom’s Lair.
Get every gold medal.
Find all 25 barrels in the sea
Catch all 5 whales in the sea.
Buy every upgrade for the boat.
Meet Onzo five times.
Find every gear.
Unlock every map in the game.
Buy all the t-shirts.
Buy all the Qälis expansions.
Buy all the backpacks.
Win every race against the pirate apprentices.
Deactivate Elit Station.
Find every piece of plastic.
Find every piece of fabric.
Find every pearl.
Get all the sunken treasures.
Reach the peak of the Black Volcano.
Beat the Colossus.
Complete the Mahla Temples.
Buy a Qälis expansion.
Beat Mr. Ecco.
Get 15 gold medals.
Get the first sunken treasure.
Buy an upgrade for the boat.
Escape from Ereti in the Navy.
Unlock a small map.
Win a race against the pirate apprentices.
Buy a backpack for Koa.
Buy a t-shirt for Koa.
Dump the trash in a frog container.
Beat Taima in the race.
Get a gold medal.
Find your first collectible.
Go up to your roof on Home Island.
Unlock the first map.
Complete the tutorial.