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