Here is the full list of all 39 9 Clues 2: The Ward achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Finish all games of Mahjong.
Finish half of all the games of Mahjong.
Finish three games of Mahjong without using Shuffle.
Finish a game of Mahjong.
Complete the Asylum Model.
Finish the game without using a Hint.
Finish all Hidden Object Puzzles without using a Hint.
Be a hero and save lives.
Gather full information about all the characters.
Solve all Puzzles without using Skip.
Gather all nine Clues in your Journal.
Watch all the cutscenes in the game without using Skip.
Create your puppet.
Find all nine Hidden Clue Symbols.
Find all fifteen Phantom Objects hidden across the game.
Find a way to call for help.
Solve all Detective Mode scenes.
Learn about Kreuz's secret.
Make your way out.
Gather five Clues in your Journal.
Finish Zed's masterpiece.
Find three fragments of the Asylum Model.
Visit the closed ward.
Finish five Hidden Object Puzzles in under two minutes each.
Finish three Hidden Object Puzzles without using a Hint.
Fix the sprinklers.
Find three Hidden Clue Symbols.
Gather three Clues in your Journal.
Regain a clear mind.
Solve five Puzzles in under two minutes each.
Find three Phantom Objects.
Fight your fears.
Find a way out.
Solve three Puzzles without using Skip.
Disarm all booby traps.
Finish one Hidden Object Puzzle without using a Hint.
View three cut scenes without using Skip.
Solve your first Detective Mode scene.
Solve a Puzzle without using Skip.