This is the complete list of unlockable trophies in Saints Row: The Third (aka Saints Row 3) for the PS3.
There are no secret trophies to unlock in this game.
A Better Person (Bronze) – Buy your first Upgrade from the Upgrade Store
And Boom Goes the Dynamite (Bronze) – Complete all instances of Heli Assault
Bo-Duke-En (Bronze) – Hijack 50 vehicles – Dukes style
Bright Lights, Big City (Gold) – Complete all City Takeover gameplay in the entire city of Steelport
Cowboy Up (Bronze) – Fully upgrade one Weapon in each slot
Dead Presidents (Bronze) – Complete ‘When Good Heists…’
Double Dose of Pimping (Bronze) – Complete all instances of Snatch
Everything is Permitted (Bronze) – Kill all of the hitman Assassination targets
Fence Killa 2011 (Bronze) – Complete all instances of Mayhem
Flash the Pan (Bronze) – Destroy all Gang Operations in Steelport
Gangstas… In Space! (Silver) – Complete Act 3 in another way
Gellin’ Like Magellan (Silver) – Explore every hood in Steelport
Gender Equality (Bronze) – Play for at least 2 hours as a male character AND 2 hours as a female character
Getting the Goods (Bronze) – Find 25% of all Collectibles
Go Into the Light (Bronze) – Complete all instances of Guardian Angel
Gotta Break Em In (Bronze) – Complete ‘The Ho Boat’
Hack the Planet (Silver) – Complete all City Takeover gameplay in the Stanfield district
Hanging With Mr. Pierce (Silver) – Complete all City Takeover gameplay in the Downtown district
Haters Gonna Hate (Bronze) – Kill 1000 Gang Members
Have A Reality Climax (Bronze) – Complete all instances of Professor Genki’s Super Ethical Reality Climax
Hi-Jack It (Bronze) – Steal and deliver all Vehicle Theft targets
I Heart Nyte Blayde (Bronze) – Complete ‘STAG Party’
Jumped In (Bronze) – Create and share a character online
kill-deckers.exe (Bronze) – Complete ‘http://deckersdie’
Kingpin (Platinum) – Unlock all Trophies in Saints Row: The Third
Kuh, Boom. (Bronze) – Complete Act 1 in another way
Life of the Party (Silver) – Find 100% of all Collectibles
Love/Hate Relationship (Bronze) – Taunt AND/OR Compliment 50 gang members
Mourning Stars (Silver) – Complete all City Takeover gameplay in the New Colvin district
Mr. Fury Would Be Proud (Silver) – Complete Act 3 in one way
Murderbrawl 31 (Bronze) – Complete ‘Murderbrawl XXXI’
Once Bitten… Braaaaaaains (Bronze) – Complete ‘Zombie Attack’
Opulence, You Has It (Bronze) – Complete ‘Party Time’
Ouch. (Bronze) – Complete all instances of Insurance Fraud
Ow My Balls! (Bronze) – Do your first nutshot AND testicle assault
Pimped Out Pad (Bronze) – Upgrade one Stronghold to its full glory
Porkchop Sandwiches (Bronze) – Complete all instances of Trail Blazing
Shake and Bake (Bronze) – Complete your first Challenge
Stay Classy Steelport (Bronze) – Kill 25 Gang Members each with ‘The Penetrator’ and ‘The Fart in a Jar’
Tank You Very Much (Bronze) – Complete all instances of Tank Mayhem
The American Dream (Bronze) – Customize 10 vehicles
The Welcome Wagon (Bronze) – Complete ‘I’m Free – Free Falling’
Third and 30 (Gold) – Spend over 30 hours in Steelport
Titanic Effort (Silver) – Complete Act 2
Tower Defense (Bronze) – Complete Act 1 in one way
Tune In, Drop Off (Bronze) – Complete all instances of Trafficking
We’re Takin’ Over (Bronze) – Complete ‘We’ve Only Just Begun’
Who Loves Ya Baby (Bronze) – Kill 50 brutes
Your Backseat Smells Funny (Bronze) – Complete all instances of Escort
You’re My Hero! (Silver) – Complete ALL Challenges
You’re the Best… (Silver) – Complete all City Takeover gameplay in the Carver Island district