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.
Find all fifteen Phantom Objects hidden across the game.
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.
Watch all the cutscenes in the game without using Skip.
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.
Create your puppet.
Find a way to call for help.
Solve all Detective Mode scenes.
Find three Hidden Clue Symbols.
Learn about Kreuz's secret.
Finish five Hidden Object Puzzles in under two minutes each.
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 three Hidden Object Puzzles without using a Hint.
Fix the sprinklers.
Solve five Puzzles in under two minutes each.
Gather three Clues in your Journal.
Regain a clear mind.
Fight your fears.
Find a way out.
Solve three Puzzles without using Skip.
Find three Phantom Objects.
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.