Here is the full list of all 44 The Council trophies - there are 32 bronze, 7 silver, 4 gold and 1 platinum.
Complete episode 1
Reach level 5
Accept to follow Elizabeth Adams
Draw Emily Hillsborrow's secret out of her
Overcome 5 confrontations in the same game
Acquire ten skills of level 1 in the same game
Complete the third quest
Persuade Napoleon that he can trust you
Manage to get Elizabeth Adams to talk about her past
In the same game, choose 20 answers before the time is up
Drop to 0 effort points during a quest
Complete the second quest
Avoid being used as a punchbag by Jacques Péru
Assist George Washington
Complete the first quest
Choose to follow sir Gregory and Cardinal Piaggi
Persuade Cardinal Piaggi to give you the letter
Become a detective
Get rid of von Borchert with your mother
Collect all the trophies
Become an occultist
Become a diplomat
Be disfigured by Gerard von Borchert
Choose to stay with George Washington and Emily Hillsborrow
Conduct the investigation about your vision
Join Emily Hillsborrow in your room
Complete a quest without using consumables
Use exactly a consumable of each type during a quest
Convince Emily Hillsborrow of the purity of your intentions when she surprises you in her room
Raise a skill to level 3
Reach level 15
Open Pandora's box
Complete the fifth quest
Complete the sixth quest
Complete episode 2
Complete the eighth quest
Complete the ninth quest
Complete episode 3
Complete the eleventh quest
Complete the twelth quest
Complete episode 4
Complete the fourteenth quest
Complete the fifteenth quest
Complete the story