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