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