Here is the full list of all 9 Mermaid Mission: Titanic achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Unlocked all three endings
Got all achievements
For getting kidnapped
For solving all the puzzles.
For sorting all the groceries
For escaping the bulkheads
For making it to the human world
For picking a really stupid alias
For navigating the shark caves