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.
Find all nine Hidden Clue Symbols.
Complete the Asylum Model.
Finish half of all the games of Mahjong.
Finish three games of Mahjong without using Shuffle.
Finish a game of Mahjong.
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 fifteen Phantom Objects hidden across the game.
Find a way to call for help.
Solve all Detective Mode scenes.
Learn about Kreuz's secret.
Find three Hidden Clue Symbols.
Find three fragments of the Asylum Model.
Make your way out.
Gather five Clues in your Journal.
Finish Zed's masterpiece.
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.
Gather three Clues in your Journal.
Regain a clear mind.
Solve five Puzzles in under two minutes each.
Fight your fears.
Find a way out.
Solve three Puzzles without using Skip.
Disarm all booby traps.
Find three Phantom Objects.
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.