Here is the full list of all 36 Oceanhorn - there are Monster of Uncharted Seas achievements worth 1,000 gamerscore.
Spend 2000 coins in the shop
Break a crate with Trencher Boots
Collect 1000 coins
Clear the entrance to Grand Core
Kill an enemy with a laser beam
Study the Arcadian History
Defeat every kind of monster in the game
Use bombs to break walls 10 times
Ship an item to another island
Find out what happened to Honey Man
Protect the Peace in Tikarel
Lift the curse from the Forest Shrine
Release the Direfolk's prisoner
Use your wits to reveal the hidden treasure
Defeat the Cepedes of Abandoned Mines
Move crates and other objects 100 times
Perform 10 successful combo attacks
Find your first Piece of Heart
Collect your first 25 coins
Read at least 10 signs
Get father's sword and shield
Melt objects 15 times using Fire Spell
Collect Bloodstones from all over the world
Reach the highest Adventurer Level
Visit all islands of Uncharted Seas
Kill 50 Spawn
Get all 8 heart containers
Kill three enemies with a single sword blow
Kill an enemy by pushing a crate
Smash 50 skeletons to pieces
Bounce an enemy with a shield 10 times
Kill an enemy with a burning arrow
Collect 10 Cursed Skulls
Beat the Creation No. 2
Swim to Canals
Catch one fish of every kind