Full list of all 19 9 Clues: The Secret of Serpent Creek achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Find all Clues connected to your investigation.
Save yourself.
Complete all the Detective Mode scenes.
Gather information on all of the characters.
Find five Clues connected to your investigation.
Solve five Puzzles without using the Skip button.
Watch the cutscene in the museum.
Get rid of Breebo for good.
Complete three Hidden-Object Puzzles without using the Hint button.
Read three newspapers.
Find three Clues connected to your investigation.
Complete your first Detective Mode.
Solve a Puzzle without using the Skip button.
Finish your first Hidden-Object Puzzle.
Solve all Puzzles without using the Skip button.
Solve three Lockpick puzzles in less than one minute.
Play with Breebo.
Find all nine
Complete all other achievements.