Full list of all 10 Submerged trophies - 5 bronze, 4 silver and 1 gold. It takes around 6-8 hours to unlock all of the trophies on PlayStation 4.
Climb to the highest point in the map
Visit all landmarks
Visit all of the hotels
Gather all secrets
Gather all boat boosts
See all creatures
Visit the n/e/s/w boundaries of the world
Stay in the boat for a complete day/night cycle
Finish the campaign
Use the postcard feature