Complete the following achievements to unlock Xbox Live Gamerscore points. 

Anger Management (20 points) - Unlock Level 3 Agro.
Competitive Glory (20 points) - Win each of the 4 tournaments at least one time.
Crossing the Line (20 points) - Finish 50 races online. 
Destroyer of Worlds (20 points) - Successfully destroy 15 opponent vehicles 
using the Payback vehicle at the Beaches garage. 
Everyone's a Critic (20 points) - Rate 25 rides online. 
Father Time (30 points) - Completely unlock a time trial by completing all 3 missions.
Getting Off the Bench (10 points) - Enter an online cruise and join a proposed race.
Go on Green (20 points) - Win 15 Red Light Races. 
Hear me Roar! (20 points) - Unlock Level 3 Roar. 
Here for a Pickup (20 points) - Successfully deliver 15 vehicles out of the garage.
How Exotic (30 points) - Beat the Exotic Champ.
In the Lap of... (20 points) - Beat the Luxury Champ.
It's How You Play The Game (30 points) - Finish 300 offline races.
Jordan Jumpman (10 points) - Spend more than 10 minutes in the air.
Just Get A Motorcycle (20 points) - In a car, drive a cumulative total of 50 miles. 
Master Thief (30 points) - Steal 80 flags while playing Capture the Flag.
Mild Dedication (10 points) - In Goal Attack, complete every goal for one race.
Name that Tune (r) -(20 points) - Beat the Tuner Champ. 
Paparazzi (10 points) - Save 16 photos to your photo album.
Postman (30 points) - Deliver 100 flags in Capture the Flag or other battle matches.
Rags To Riches (30 points) - Have $1 million dollars in the bank while playing.
Ranking Up (30 points) - Win 20 ranked matches online.
Retire the Master (50 points) - Beat the City Champ. 
Saving Los Angeles (10 points) - Enter the Race Editor, create a race, and then save it.
Set To Stun (20 points) - Unlock Level 3 EMP. 
Streaker (20 points) - Win 5 races in a row offline. 
T-Mobile myFaves (10 points) - Join an online game with 5 of your friends.
Stay Connected with MyFaves from T-Mobile. 
The Basics (10 points) - Complete one of the missions you receive in the mission log.
The Winner (30 points) - Win 180 offline races. 
Turn in the Work (10 points) - Submit a vehicle to Rate My Ride.
Two Wheels of Fury (30 points) - Beat the Motorcycle Champ. 
Uncle Time (20 points) - Finish the first mission for each of the 4 time trials.
Waldo's Still Missing (40 points) - Find all the collectables in Los Angeles.
Wanted Man (10 points) - Pull over while the police are in 'pull over' 
mode, then drive away during the ticketing cutscene. 
What's a Speed Limit? (20 points) - Win 15 dynamic freeway races. 
Where in the World? (10 points) - Find half of the collectables in Los Angeles. 
Who Made This? (10 points) - Enter a Race Editor Race online. 
Winning With Less (20 points) - Win 10 races on a motorcycle. 
World's Strongest (20 points) - Beat the Muscle Champ. 
Zoning Out (20 points) - Unlock Level 3 Zone.