Here is the full list of all 23 Sea of Solitude (EU) trophies - there are 6 bronze, 9 silver, 7 gold and 1 platinum.
You have collected all of the other trophies.
Swam a very long distance
Swam long distance while whale was around
Eaten by Whale 20 times
Got grabbed by waterhands 10 times
Respawned on couch in Skyscraper
Shooed all Seagulls
Finished the game
Finished Level 3
Finished Level 2
Collected all bottles
Reached top of the Skyscraper
Finished Level 1
Travelled a long distance by boat
Travelled very far by foot
Made it through school
Fired 30 flares
Opened a path through water
Jumped headfirst into the water from a high point
Shooed your first Seagull
Collected your first Message in a bottle
Connect with mirror Kay for the first time
Fired the first flare