Racing
Complete all races : Cow Boy Hat Available at Crib
Complete all car races : Race Car
Complete all motorcycle races: Race Motorcycle
Complete all boat races: Race Boat
Complete all plane races: Race Plane
Complete all helicopter races: Race Helicopter
Trail Blazing
Total Completion : Fire Suit unlocked at Crib
Downtown Level 3 Completed : Incoming Dmaage from Explosions reduced by 5%
Downtown Level 6 Completed : Incoming Dmaage from Explosions reduced by 15%
Apartments Level 3 Completed : Brotherhood Notoriety Reduces 5% Faster
Apartments Level 6 Completed : Brotherhood Notoriety Reduces 15% Faster
Septic Avenger
Total Completion : Septic Truck available at Crib
Red Light Level 3 Completed: 5% Discount on Food/Liqour
Red Light Level 6 Completed: 15% Discount on Food/Liqour
Suburbs Expansion Level 3 Completed: Weapon accuracy +5%
Suburbs Expansion Level 6 Completed: Weapon accuracy +15%
Mayhem
Red Light District Level 3 Completed: 5% Discount on Crib Customizations
Red Light District Level 6 Completed: 15% Discount on Crib Customizations
Nuclear Power Plant Level 3 Completed: Flamethrower at Crib
Nuclear Power Plant Level 6 Completed: Annihilator RPG at Crib
Demo Derby
Total Completion : Demolition Derby Cars at Crib
Stillwater University Level 3 Completeted: 5% Discount at Mechanics
Stillwater University Level 6 Completeted: 15% Discount at Mechanics
Crowd Control
Suburbs Level 3 Completed: 5% Discount on Clothes
Suburbs Level 6 Completed: 15% Discount on Clothes
Hotel & Marina Level 3 Completed: Pepper Spray at Crib
Hotel & Marina Level 6 Completed: Chainsaw at Crib
Escort
Total Completion: Escort Vehicle available at Crib
Stillwater University Level 3 Completed: Sons of Samedi Notoriety Reduces 5% Faster
Stillwater University Level 6 Completed: Sons of Samedi Notoriety Reduces 15% Faster
Red Light Level 3 Completed: $1,000 vehicle Delivery
Red Light Level 6 Completed: Free Vehicle Delivery
Fight Club
Stillwater Prison Level 3 Completed: Special Homie Legal Lee
Stillwater Prison Level 6 Completed: Special homie Troy
Arena Fight Club Leve 3 Completed: Melee damage increased by 5% (possibly +15%, Either Guide is wrong or it is a game glitch)
Arena Fight Club Leve 6 Completed: Melee damage increased by 15% (possibly +30% either the guide is wrong or it is a game glitch)
Drug Trafficking
Airport Level 3 Completed: XS-2 Ultimax Shotgun at Crib
Airport Level 6 Completed: Unlimited Shotgun Ammo
Hotels & Marina Level 3 Completed: Ronin Notoriety reduces 5% faster
Hotels & Marina Level 6 Completed: Ronin Notoriety reduces 15% faster
Fuzz
Suburbs Expansion Level 3 Completed: Police Notoriety reduces 5% faster
Suburbs Expansion Level 6 Completed: Police Notoriety reduces 15% faster
Projects Level 3 Completed: Kobra (Pistol) at Crib
Projects Level 6 Completed: Unlimited Pistol Ammo
Heli Assault
Barrio Level 3 Completed: Incoming bullet damage decreased by 5%
Barrio Level 6 Completed: Incoming bullet damage decreased by 15%
Trailer Park Level 3 Completed: 5% Discount on weapon purchases
Trailer Park Level 6 Completed: 15% Discount on weapon purchases
Insurance Fraud
Factories District level 3 Completed: Double Sprint duration
Factories District Level 6 Completed: Inifinite Sprint
Museum Level 3 Completed: Dmaage from Vehicles reduced by 5%
Museum Level 6 Completed: Dmaage from Vehicles reduced by 15%
Snatch
Chinatown Level 3 Completed: Health Regeneration speed x2
Chinatown Level 6 Completed: Health Regeneration speed x3
Downtown Level 3 Completed: GAL 43 SMG at Crib
Downtown Level 6 Completed: Infinite SMG Ammo
Hitman
One List Completed: Grenades at Crib
Two Lists Completed: Satchel Charges at Crib
All Lists Completed: Unlimited Rifle Ammo
Chop Shop
One List Completed: Buggy available at Crib
Two Lists Completed: Combine Available at Crib
All Lists Completed: 75% discount when buying Vehicles
CD Collections
10/50: Bachelors Samba
20/50: Coconuts
30/50: Marvelous Singers Remix
40/50: Stereo Cha Cha
50/50: 100% Discount at Music Store
Jobs
Ambulance EMT: Shock Paddles and Ambulance at Crib
Fire Truck: Fire Fighter Outfit and Custom Fire Truck at Crib
Ho-ing: Custom Saints Pimp Outfit
Taxi Driver: Custom Taxi at Crib
Tow Truck: Custom Tow Truck at Crib
Stunt/Combat Tricks
Driving Stunts: 3 Gold Stars in Big Air, Oncoming Traffic and Near Miss - Stunt Vehicle at Crib
Vehicle Surfing: 3 Gold Stars - Traffic Cone Hat at Crib
Combat Tricks: 3 Gold Stars in Gang Kills, 1 Bronze in all other combat tricks - AR-50 XMAC with Grenade Launcher at Crib
Basejumping: 3 Gold Stars in Basejumping - Reduce Falling damage by 100%
Avenger jacket: Get a "3 Gold Star" rank in Gang Kills.
Hostages (Has to be 10 DIFFERENT times, not 3 hostages in 1 car done 3 times and then one hostage in another)
10 Hostages Completed: ATV Vehicle at Crib
Mugging
30 Muggings: Paintball headgear at Crib
50 Muggings: Special homie Jane Valderama
Store Hold-Ups
20 Hold ups: 100% Discount on Food/Liqour
Zombie Uprising
Complete Zombie Uprising Minigame: Zombie Mask at Crib
Weapons
Minigun: Successfully complete Brotherhood, Mission 10.
Pimpcane: Successfully complete Epilogue, Mission 2.
Gang
One follower: Successfully complete Prologue, Mission 4.
Two followers: Reach 25% hoods conquered.
Three followers: Reach 50% hoods conquered.
Johnny Gat: Successfully complete Ronin, Mission 11.
Pierce: Successfully complete Brotherhood, Mission 11.
Shaundi: Successfully complete Sons Of Samedi, Mission 11.
Tobias: Successfully complete Sons Of Samedi, Mission 3.
Zombie Carlos: By calling Eye for an Eye 555-5966
Customization
Bodyguards gang style: Progress through the game.
Ninjas gang style: Progress through the game.
Brotherhood personality: Successfully complete Brotherhood, Mission 11.
Ronin personality: Successfully complete Ronin, Mission 11.
Samedi personality: Successfully complete Sons Of Samedi, Mission 11.
Brotherhood melee: Successfully complete Brotherhood, Mission 6.
Ronin melee: Successfully complete Ronin, Mission 6.
Samedi melee: Successfully complete Sons Of Samedi, Mission 6.
Vehicles
Akuji's prototype bike: Successfully complete Ronin, Mission 11.
Attack helicopter: Successfully complete Epilogue, Mission 4.
Brotherhood vehicles: Successfully complete Brotherhood, Mission 11.
Donnie's vehicle: Successfully complete Brotherhood, Mission 2.
Gang customization cars: Reach 15% hoods conquered.
Gang customization cars (more): Reach 45% hoods conquered.
Gang customization cars (even more): Reach 65% hoods conquered.
The General's Bulldog (Hummer with infinite chaingun ammo): Successfully complete Sons of Samedi, Mission 11.
Julius' car: Successfully complete Bonus Mission 1.
Maero's Monster Truck: Successfully complete Brotherhood, Mission 11.
Medical helicopter: Successfully complete Ronin, Mission 7.
News helicopter: Successfully complete Sons Of Samedi, Mission 3.
Ronin vehicles: Successfully complete Ronin, Mission 11.
Sons Of Samedi vehicles: Successfully complete Sons of Samedi, Mission 11.
Tornado attack helicopter: Successfully complete the final mission of the Ultor epilogue.
Ultor APC: Successfully complete Epilogue, Mission 2.
Other Abilities
No fall damage: Land a perfect base jump. (3 gold stars)
Jump from a tall building or out of a helicopter and press Y to pull your chute. Soon after you will be prompted to press Y to start the base jumping mission. You must land in the middle of the target (on the Saints car) to get 3 gold stars.
This information is from my Bradygamers Saints Row 2 Guide Book, Hope it helps.
Thanks to aPerfektFIaw also for helping fill in the Weapons, Gangs, Customizations and Vehicles.
To Clear Up some of the Posts.
The Guide Book isnt 100% Correct as it says.
Unlimited Rifle Ammo - Gives you Unlimited Sniper Ammo Also even thou it doesnt come up under Rifles but as a Special Weapon.
It says 3 Lists for Hitman and Chop Shop where as it is ALL lists, So they probably added more content after the guide book was issued and the book was never updated.