Here is the full list of all 42 Hidden Agenda trophies - there are 21 bronze, 18 silver, 2 gold and 1 platinum.
Earn all other trophies
Finn teams up with Adam
Becky murders her sergeant
Becky tells Finn about Calvary's murder
The Trapper tries to commit suicide
Felicity burns to death
The Trapper dies
Becky and Felicity both die
Felicity tricks the killer into an ambush
Felicity breaks into Simon's residence
Finn leads Becky to Adam
Becky defuses a bomb
Simon is revealed as the Trapper
Becky catches a prowler in the cabin
Vernon LeMay falls to his death
Complete Story Mode
The Trapper is arrested
Becky's partner helps her escape the cops
Becky shoots Judge Vanstone
Daniella Cárdenas identifies the Trapper
Finn escapes from police custody
Becky uncovers Adam's backstory
Becky swears at her partner
Unanimously agree on a Trust question
Felicity convinces Judge Vanstone to release Finn
Takeover a takeover
Complete an Endgame Agenda
Complete Competitive Mode
Complete the game without ever using a weapon
The investigation hits a deadend
Becky dies in an explosion
Becky is drugged
Becky finds the spycam
Becky links the hooker to two previous murders
Becky finds Father Rominski's "Play Room"
Foil a Hidden Agenda
Find every clue in a single search
Unanimously identify who has the Hidden Agenda
Win a Hidden Agenda
Don't shoot during a combat event
Succeed on a Quick Time Event
Make your first choice