Here is the full list of all 31 Nightmares from the Deep 3: Davy Jones trophies - there are 8 bronze, 18 silver, 4 gold and 1 platinum.
Unlock every Trophy.
Finish 3 Hidden Object Puzzles by playing Mahjong.
Complete the game.
Complete the game on expert difficulty.
Cancel all of the pacts.
Finish all Puzzles without using the Skip Button.
Find all of the hidden puzzle pieces.
Find all of the Pirate Cards.
Find all the glowing seahorses.
Interact with 16 Animals on the Island.
Listen to all of the Guardians’ stories.
Finish all Hidden Object Puzzles without using hints.
Open the Forbidden Gate.
Brew O’Malley's potion.
Get the witch to help you.
Find the hint about the treasure of Davy Jones.
Finish any Hidden Object scene with less than 4 mistakes.
Get to O’Malley’s Hideout.
Reconnect with Cory.
Find the first Pirate Card.
Finish 6 Hidden Object Puzzles in a row without using hints.
Find out what Davy Jones is hiding in the Icehouse.
Find out how to cancel the pact.
Find 5 hidden objects within 5 seconds.
Get to the prison cell.
Complete 3 Puzzles without using the Skip Button.
Interact with 3 Animals on the Island.
Find the first hidden puzzle piece.
Find a glowing seahorse.
Finish any Hidden Object Puzzle in less than 1 minute.
Escape from the cell.