Here is the full list of all 39 Koa and the Five Pirates of Mara (EU) trophies - there are 18 bronze, 17 silver, 3 gold and 1 platinum.
You got it!
Complete the tutorial
Unlock the first map
Unlock a small map
Unlock every map in the game
Get the first sunken treasure
Get all the sunken treasures
Meet Onzo five times
Beat Taima in the race
Escape from Ereti in the Navy
Beat Mr. Ecco
Complete the Mahla Temples
Beat the Colossus
Reach the peak of the Black Volcano
Deactivate Elit Station
Complete Grant Loom’s Lair
Win a race against the pirate apprentices
Win every race against the pirate apprentices
Get a gold medal
Get 15 gold medals
Get every gold medal
Find your first collectible
Find every piece of fabric
Find every pearl
Find every piece of plastic
Find every gear
Buy an upgrade for the boat
Buy every upgrade for the boat
Buy a t-shirt for Koa
Buy all the t-shirts
Buy a backpack for Koa
Buy all the backpacks
Buy a Qälis expansion
Buy all the Qälis expansions
Pet the dog
Go up to your roof on Home Island
Dump the trash in a frog container
Catch all 5 whales in the sea
Find all 25 barrels in the sea