This is the complete list of unlockable achievements in Saints Row: The Third (aka Saints Row 3) for the Xbox 360.
There are no secret achievements to unlock in this game.
A Better Person (15) – Buy your first Upgrade from the Upgrade Store
And Boom Goes the Dynamite (20) – Complete all instances of Heli Assault
Bo-Duke-En (10) – Hijack 50 vehicles – Dukes style
Bright Lights, Big City (80) – Complete all City Takeover gameplay in the entire city of Steelport
Cowboy Up (10) – Fully upgrade one Weapon in each slot
Dead Presidents (10) – Complete ‘When Good Heists…’
Double Dose of Pimping (20) – Complete all instances of Snatch
Everything is Permitted (10) – Kill all of the hitman Assassination targets
Fence Killa 2011 (20) – Complete all instances of Mayhem
Flash the Pan (10) – Destroy all Gang Operations in Steelport
Gangstas… In Space! (30) – Complete Act 3 in another way
Gellin’ Like Magellan (20) – Explore every hood in Steelport
Gender Equality (10) – Play for at least 2 hours as a male character AND 2 hours as a female character
Getting the Goods (10) – Find 25% of all Collectibles
Go Into the Light (20) – Complete all instances of Guardian Angel
Gotta Break Em In (25) – Complete ‘The Ho Boat’
Hack the Planet (25) – Complete all City Takeover gameplay in the Stanfield district
Hanging With Mr. Pierce (25) – Complete all City Takeover gameplay in the Downtown district
Haters Gonna Hate (15) – Kill 1000 Gang Members
Have A Reality Climax (20) – Complete all instances of Professor Genki’s Super Ethical Reality Climax
Hi-Jack It (10) – Steal and deliver all Vehicle Theft targets
I Heart Nyte Blayde (25) – Complete ‘STAG Party’
Jumped In (10) – Create and share a character online
kill-deckers.exe (25) – Complete ‘http://deckersdie’
Kuh, Boom. (20) – Complete Act 1 in another way
Life of the Party (20) – Find 100% of all Collectibles
Love/Hate Relationship (10) – Taunt AND/OR Compliment 50 gang members
Mourning Stars (25) – Complete all City Takeover gameplay in the New Colvin district
Mr. Fury Would Be Proud (30) – Complete Act 3 in one way
Murderbrawl 31 (25) – Complete ‘Murderbrawl XXXI’
Once Bitten… Braaaaaaains (25) – Complete ‘Zombie Attack’
Opulence, You Has It (20) – Complete ‘Party Time’
Ouch. (20) – Complete all instances of Insurance Fraud
Ow My Balls! (10) – Do your first nutshot AND testicle assault
Pimped Out Pad (10) – Upgrade one Stronghold to its full glory
Porkchop Sandwiches (20) – Complete all instances of Trail Blazing
Shake and Bake (10) – Complete your first Challenge
Stay Classy Steelport (10) – Kill 25 Gang Members each with ‘the Penetrator’ AND the Fart in a Jar
Tank You Very Much (20) – Complete all instances of Tank Mayhem
The American Dream (10) – Customize 10 vehicles
The Welcome Wagon (15) – Complete ‘I’m Free – Free Falling’
Third and 30 (40) – Spend over 30 hours in Steelport
Titanic Effort (40) – Complete Act 2
Tower Defense (20) – Complete Act 1 in one way
Tune In, Drop Off (20) – Complete all instances of Trafficking
We’re Takin’ Over (20) – Complete ‘We’ve Only Just Begun’
Who Loves Ya Baby (10) – Kill 50 brutes
Your Backseat Smells Funny (20) – Complete all instances of Escort
You’re My Hero! (30) – Complete ALL Challenges
You’re the Best… (25) – Complete all City Takeover gameplay in the Carver Island district
