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.
Find all morphing parrots.
Finish all the games of Mahjong.
Finish half of all the games of Mahjong.
Find all hidden octopi.
Tried to get through the labyrinth without the map.
Finish a game of Mahjong in less than 1 minute.
Complete the game.
Got to the contents of Davy Jones' chest.
Finished all the puzzles without using the Skip button.
Finished all Hidden Object Puzzles.
Gather twelve golden fish tokens.
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.
Fix the radio.
Finished 10 Hidden Object Puzzles in a row without any hints.
Find all secret seahorses.
Enter the shipwreck cemetery.
Find 4 Hidden Objects within 4 seconds.
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.
Finish any Hidden Object scene with less than 3 misclicks.
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.