Here is the full list of all 28 The Myth Seekers 2: The Sunken City achievements.
You retrieved the ship from the bottom of the sea.
You managed to hit your target.
You befriended the dog.
You created a beautiful cake.
Find all Collectibles.
Finish all Hidden Object Puzzles without any Hints.
You summoned the Ghost of Gradlon.
Your sense of balance stood the test.
You saved the Mermaid's fishes.
You revealed your way to Ys.
You reached your destination.
You located the Dark Forest.
You learned the story of the Dark Forest.
You restored the statuette's headdress.
Finish a Hidden Object Puzzle without any mistakes.
Finish three Hidden Object Puzzles without any Hints.
You successfully navigated the cemetery alleys.
You managed to reveal the Caretaker's secret niche.
You managed to free the Caretaker from the vines.
Complete five Minigames without skipping.
You successfully deciphered the secret message of Fabien.
You successfully found the hidden symbols.
Complete two Minigames without skipping.
Complete a Minigame in less than a minute.
You managed to stop the fire from spreading.
Finish all Minigames without skipping.
Finish a Hidden Object Puzzle in less than a minute.
Finish Hidden Object Puzzles in 45 seconds without Hints.