In 'Career' mode earn the following amount of Kudos to unlock the corresponding car. When the car is unlocked it will automatically be added to your garage and you must then purchase it from the Car Shop.

10,000 Kudos - Ford Mustang GTR

50,000 Kudos - Nissan GTR

90,000 Kudos - Cadillac 16

120,000 Kudos - Ford Supercar Concept

160,000 Kudos - Shelby Cobra

230,000 Kudos - Toyota GT-One

300,000 Kudos - Ford GT90

390,000 Kudos - Shelby GR-1

475,000 Kudos - RUF Supercar Concept

10 - Photographer:
In each of the different cities take and save a picture

10 - Track Builder:
Create and save 10 Custom Routes

15 - Arcade Player:
Play Geometry Wars 1 and 2 in the garage

15 - Gotham TV Sports Fan:
Watch Gotham TV 10 times and save a Replay of a race

20 - Rank 10:
Get to Rank 10

30 - Gotham Hero:
Be featured on Gotham TV

30 - Steel Champion:
Complete ALL championships at Steel Level

45 - Lamborghini Owners Club:
Own ALL the Lamborghini Cars

45 - Exotic Car Club:
Own McLaren F1 LM, Shelby GT 500, Corvette ZR1, Ford GT-40 MK 1, RUF CTR 'Yellow Bird',
TVR Cerbera Speed Twelve, Callaway Sledgehammer Twin Turbo

45 - Ferrari Owners Club:
Own ALL the Ferrari cars

50 - Bronze Champion -
Complete all championships at Bronze Level

50 - Rank 5:
Get to Rank 5

50 - Race Against The Clock:
Set a lap time for every circuit in 'Race Against the Clock' mode

50 - Style Racer Badge:
25m powerslide, 10x Combo, 25k Online Kudos, 1k Kudos in a race, Kudos for every maneouvre

60 - Online Professional
50 Online races, Start 1st/finish last, 3-event win streak, Clean race, Win each scenario

60 - Pro Racer Badge:
Earn a Platinum Medal using manual transmission

60 - Silver Champion:
Complete ALL championships at Silver Level

75 - Gold Champion:
Complete ALL Championships at Gold Level

80 - Rank 1:
Get to Rank 1

100 - Platinum Champion:
Complete ALL championships at Platinum Level

Two Extra Games:
Select 'View Cars' and choose to walk around in your garage and at the back you will see two games set up called Geometry 1 and 2.