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 all the games of Mahjong.
Finished all the puzzles without using the Skip button.
Finish half of all the games of Mahjong.
Finish a game of Mahjong in less than 1 minute.
Complete the game.
Got to the contents of Davy Jones' chest.
Finished all Hidden Object Puzzles.
Gather twelve golden fish tokens.
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.
Prepare a spiked coffee.
Found your way inside the lighthouse.
Finished 10 Hidden Object Puzzles in a row without any hints.
Finished a puzzle in less than 1 minute.
Fix the radio.
Finished a Hidden Object Puzzle in less than 1 minute.
Find all secret seahorses.
Enter the shipwreck cemetery.
Tried to get through the labyrinth without the map.
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.
Finish any Hidden Object scene with less than 3 misclicks.
Visited a local bar.
Find 4 Hidden Objects within 4 seconds.
Witnessed the devastating attack of the sea monster.
Arrived on the pier.