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