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