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