When you complete the following tasks you will be rewarded with the corresponding Trophy. There are 10 South Central DLC trophies in total.

Bronze - Big Ballin':
Win 10 races in an SUV.

Bronze - Brother Time:
Complete the 3 missions for the South Central time trial.

Bronze - Easier Than The Hills:
Complete the South Central tournament.

Bronze - Goin' South:
Meet the South Central Mechanic.

Bronze - Low Ballin':
Win 10 races in a Low Rider.

Bronze - Money For Nothing:
Complete the South Central Wager mission.

Bronze - Sign Here
Complete 10 deliveries in South Central.

Bronze - South Central Test Drive
Take 1 South Central vehicle out for a test drive.

Silver - Been There, Done That:
Finish the South Central career.

Silver - GOOOOAAAAAALLLLL!!!!!
Finish ALL South Central Goal Attacks.

When you complete the following tasks you will be rewarded with the corresponding Trophy. There are 46 trophies in total.

Bronze - Anger Management:
Unlock Level 3 AGRO.

Bronze - Crossing The Line:
Finish 50 races Online.

Bronze - Everyone's A Critic:
Rate 25 rides Online.

Bronze - Father Time:
Completely unlock a time trial by completing ALL 3 missions.

Bronze - Getting Off The Bench:
Enter an Online cruise and join a proposed race.

Bronze - Go On Green:
Win 15 Red Light Races.

Bronze - Hear Me Roar!:
Unlock Level 3 Roar.

Bronze - Jordan Jumpman:
Spend more than 10 minutes in the air. Brought to you by Jordan Brand.

Bronze - Mild Dedication:
In Goal Attack, complete every goal for one race.

Bronze - Neither Bird Nor Plane:
Travel 1020 feet in a single jump.

Bronze - Out On Bail:
Evade the police successfully when they are in pursuit.

Bronze - Paparazzi:
Save 16 photos to your photo album.

Bronze - Saving Los Angeles:
Enter the Race Editor, create a race, and then save it.

Bronze - Set To Stun:
Unlock Level 3 EMP.

Bronze - Streaker:
Win 5 races in a row offline.

Bronze - T-Mobile MyFaves:
Join an online game with 5 of your friends. Stay Connected with MyFaves from T-Mobile.

Bronze - The Basics:
Complete one of the missions you receive in the mission log.

Bronze - Turn In The Work:
Submit a vehicle to Rate My Ride.

Bronze - Uncle Time:
Finish the first mission for each of the 4 time trials.

Bronze - Wanted Man:
Pull over while the police are in 'Pull Over' mode, then drive away during the ticketing cutscene.

Bronze - What's A Speed Limit?:
Win 15 dynamic freeway races.

Bronze - Where In The World?:
Find half of the collectables in Los Angeles.

Bronze - Who Made This?:
Enter a Race Editor Race online.

Bronze - Winning With Less:
Win 10 races on a motorcycle.

Bronze - Zoning Out:
Unlock Level 3 ZONE.

Silver - Competitive Glory:
Win each of the 4 tournaments at least one time.

Silver - Destroyer Of Worlds:
Successfully destroy 15 opponent vehicles using the Payback vehicle at the Beaches garage.

Silver - Have Car, Will Travel:
Drive a total of 5,000 miles, including any miles driven online or offline.

Silver - Here For A Pickup:
Successfully deliver 15 vehicles out of the Hollywood garage.

Silver - How Exotic:
Beat the Exotic Champ.

Silver - In The Lap Of..:
Beat the Luxury Champ.

Silver - It's How You Play The Game:
Finish 300 Offline races. Winning is not required.

Silver - Just Get A Motorcycle:
In a car, drive a cumulative total of 50 miles on 2 wheels.

Silver - Master Thief:
Steal 80 flags while playing 'Capture the Flag' or other battle matches.

Silver - Name That Tuner:
Beat the Tuner Champ.

Silver - Postman:
Deliver 100 flags in Capture the Flag or other battle matches.

Silver - Rags To Riches:
Have $1 million dollars in the bank while playing in Los Angeles.

Silver - Ranking Up:
Win 20 Tiered Matches online.

Silver - Retire the Master:
Beat the City Champ.

Silver - The Winner:
Win 180 offline races.

Silver - Two Wheels of Fury:
Beat the Motorcycle Champ.

Silver - Unicycle:
Drive a cumulative total of 50 miles while doing a wheelie on a motorcycle.

Silver - Waldo's Still Missing:
Find ALL the collectables in Los Angeles.

Silver - World's Strongest:
Beat the Muscle Champ.

Gold - True Dedication:
ALL Goal attacks must be unlocked and every goal for every race completed.

Platinum - The Completist!:
Unlock the Platinum trophy by unlocking ALL other trophies.

This feature becomes available when you get the 'Idol' rank (33,500 Reputation).

When you have participated in the indicated number of races for a specific vehicle class the corresponding customizable item for that particular class (Luxury, Tuners, Muscles, Exotics or Superbikes) will become available.

Skirts: 9 races

Front Bumpers: 9 Races

Rear Bumpers: 18 Races

Car Spoilers: 18 Races

Motorcycle Tails: 18 Races

Car Stereos: 27 Races

Front Seats: 27 Races

Steering Wheels: 27 Races

Motorcycle Tanks: 27 Races

Post Gauges: 27 Races

Taillights: 36 Races

Car Headlights: 36 Races

Motorcycle Bowls: 36 Races

Hoods: 36 Races

Blowers: 45 Races

Exhausts: 45 Races

Intercoolers: 45 Races

Widebody Kits: 45 Races

The following vehicle groups become available when you reach the indicated rank.

Unlock Group 2:
Get the 'Student Driver' rank (2,000 Reputation).

Unlock Group 3:
Get the 'Racer' rank (8,060 Reputation).

Unlock Group 4:
Get the 'Champion' rank (16,500 Reputation).

The following Performance Upgrades will become available when you reach the indicated rank.

Unlock Level 1 Performance Upgrades for Group 1 Vehicles:
Get the 'Navigator' rank (800 Reputation).

Unlock Level 1 Performance Upgrades for Group 2 Vehicles:
Get the 'Driver' rank (5,600 Reputation).

Unlock Level 1 Performance Upgrades for Group 3 Vehicles:
Get the 'Elite Racer' rank (13,700 Reputation).

Unlock Level 1 Performance Upgrades for Group 4 Vehicles:
Get the 'Savant' rank (22,760 Reputation).

Unlock Level 2 Performance Upgrades for Group 1 Vehicles:
Get the 'Rookie' rank (3,610 Reputation).

Unlock Level 2 Performance Upgrades for Group 2 Vehicles:
Get the 'Veteran' rank (10,760 Reputation).

Unlock Level 2 Performance Upgrades for Group 3 Vehicles:
Get the 'Legend' rank (19,540 Reputation).

Unlock Level 2 Performance Upgrades for Group 4 Vehicles:
Get the 'Hero' rank (26,160 Reputation).

When you win the indicated events in 'LA Career' mode the corresponding bonus cars will become unlocked.

Unlock 2004 Ford SVT Focus:
Win 'Cool Breeze' series race.

Unlock 2004 Ford Cobra Concept:
Win '10 Carat Beatdown' series race.

Unlock 1969 Chevrolet Camara RS SS:
Win 'Bird On The Line' series race.

Unlock 2006 Mitsubishi Lancer Evolution IX:
Win 'Beach Overlook' series race.