Full list of all 29 Nightmares from the Deep 2: The Sirens Call achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Complete the game.
Got to the contents of Davy Jones' chest.
Gather twelve golden fish tokens.
Finished all Hidden Object Puzzles.
Got to the top of the lighthouse and saw what's underneath.
Enabled your ally to return to work.
Prepare a spiked coffee.
Found your way inside the lighthouse.
Finish any Hidden Object scene with less than 3 misclicks.
Fix the radio.
Find 4 Hidden Objects within 4 seconds.
Enter the shipwreck cemetery.
Finished a Hidden Object Puzzle in less than 1 minute.
Saved your ally from a tight spot.
Find a direct way to get behind the closed gates.
Finished 5 puzzles in a row without using the Skip button.
Visited a local bar.
Finished a puzzle in less than 1 minute.
Witnessed the devastating attack of the sea monster.
Arrived on the pier.
Tried to get through the labyrinth without the map.
Finished all the puzzles without using the Skip button.
Finished 10 Hidden Object Puzzles in a row without any hints.
Finish a game of Mahjong in less than 1 minute.
Finish half of all the games of Mahjong.
Finish all the games of Mahjong.
Find all secret seahorses.
Find all morphing parrots.
Find all hidden octopi.