Here is the full list of all 31 Nightmares from the Deep 2: The Siren's Call trophies - there are 14 bronze, 10 silver, 6 gold and 1 platinum.
Unlock every Trophy.
Complete the bonus adventure.
Finish all the games of Mahjong.
Finish a game of Mahjong in less than 1 minute.
Finish half of all the games of Mahjong.
Complete the game.
Complete the game on expert difficulty.
Get to the contents of Davy Jones' chest.
Gather twelve golden fish tokens.
Finish all the puzzles without skipping.
Finish all Hidden-Object Scenes.
Get to the top of the lighthouse and see what's underneath.
Find all morphing parrots.
Find all hidden octopi.
Enable your ally to return to work.
Prepare a spiked coffee.
Find your way inside the lighthouse.
Finish 10 Hidden-Object Scenes in a row without using any hints.
Fix the radio.
Find all secret sea horses.
Enter the shipwreck cemetery.
Finish a Hidden-Object Scene in less than 1 minute.
Save your ally from a tight spot.
Find a direct way to get behind the closed gates.
Finish 5 puzzles in a row without skipping.
Finish a puzzle in less than 1 minute.
Find 4 Hidden Objects within 4 seconds.
Visit local bar.
Finish any Hidden Object scene with less than 3 mistakes.
Witness the devastating attack of the sea monster.
Arrive on the pier.