Here is the full list of all 39 Sherlock Holmes Chapter One achievements.
Talk to Dilwyn in his hat.
Investigate the third accident.
Take pity on a poor girl.
Present accurate evidence in all accusations.
Follow the rules of the Blind Duelling Club.
Remember everything.
Let an old man have his retirement.
Uncover all of the treasures.
Solve all the cases for the police.
Refurbish the entire manor.
Fight in all of the bandit lairs.
Talk to The Pipe in the correct disguise.
Get justice for Fabio.
Lift the curtain on bohemian life.
Open the cabinet of curiosities.
Disappoint Mycroft.
Find the book.
Refuse to help Mycroft.
Always advocate for the refugees.
Punch first, ask questions later.
Acquire Sherlock's famous violin.
Hold an eel by the tail.
Spare the landlady's feelings.
Kill fifteen enemies.
Kill five enemies.
Arrest twenty-five enemies.
Disorient ten enemies with the snuffbox.
Open Violet's room.
Save Goliath's life.
Find all the books in the Bazookaeology trilogy.
Arrest ten enemies.
Open Sherlock's room.
Prank Mrs. Nini.
Solve the first case on Cordona.
Eavesdrop on your first piece of gossip.
Try to take the easy way out.
Interrogate every suspect in the safe murder as a police officer.
Complete all Cordona Stories.
Get every achievement.