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