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.
Find 4 Hidden Objects within 4 seconds.
Got to the top of the lighthouse and saw what's underneath.
Enabled your ally to return to work.
Prepare a spiked coffee.
Finish any Hidden Object scene with less than 3 misclicks.
Found your way inside the lighthouse.
Fix the radio.
Enter the shipwreck cemetery.
Tried to get through the labyrinth without the map.
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.
Visited a local bar.
Witnessed the devastating attack of the sea monster.
Arrived on the pier.
Finished a puzzle in less than 1 minute.
Finished 5 puzzles in a row without using the Skip button.
Finished all the puzzles without using the Skip button.
Finished 10 Hidden Object Puzzles in a row without any hints.
Finished all Hidden Object Puzzles.
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.