Go to view cars, then choose to walk around in your garage. Go in the back and you will see two games set up, called Geometry Wars 1 and 2.
Xbox Live gamer points:
Complete the following achievements to unlock the indicated number of Xbox Live Gamerscore points.
Arcade Player: Play the Geometry Wars 1 and 2 mini-games in the garage (15 points).
Bronze Champion: Complete all championships at the Bronze level (50 points).
Exotic Car Club: Own the McLaren F1 LM, Shelby GT 500, Ford GT-40 MK 1, Corvette ZR1, TVR Cerbera Speed Twelve, RUF CTR "Yellow Bird", and Callaway Sledgehammer Twin Turbo (45 points).
Ferrari Owners Club: Own every Ferrari model (45 points).
Gold Champion: Complete all championships at the Gold level (75 points).
Gotham Hero: Get featured on Gotham TV (30 points).
Gotham TV Sports Fan: Watch Gotham TV ten times and save a replay of a race (15 points).
Lamborghini Owners Club: Own every Lamborghini model (45 points).
Online Professional: Participate in fifty online races, start first, finish last, have a 3-event winning streak, have a clean race, and win each scenario (60 points).
Photographer: Save a picture in each city (10 points).
Platinum Champion: Complete all championships at the Platinum level (100 points).
Pro Racer Badge: Earn the "Platinum" medal using a manual transmission (60 points).
Race Against The Clock: Set a lap time for all circuits in Race Against The Clock mode (50 points).
Rank 1: Reach Rank 1 (80 points).
Rank 5: Reach Rank 5 (50 points).
Rank 10: Reach Rank 10 (20 points).
Silver Champion: Complete all championships at the Silver level (60 points).
Steel Champion: Complete all championships at the Steel level (30 points).
Style Racer Badge: Get a 25m powerslide, 10x combo, 25,000 Online Kudos; 1,00 Kudos in a race, and Kudos for each maneuver (50 points).
Track Builder: Create and save ten custom routes (10 points).