Forza Motorsport 2

You'll need to buy 80 cars to get this achievement which could cost a maximum of 11,325,000 credits if you were to buy them all at full price. However, you can win quite a few from various races, you'll be gifted a few from levelling up and you'll earn a 50% discount on all cars in your current region after reaching level 30. So, that huge bill could come down to 3,887,750 credits. Don't forget to look for bargains in the auction house too. Some of the cars only unlock for sale when you reach a certain level, 3 of the Saleen cars for example will only be available to buy after you reach level 48. Cars required: -

ACURA
#42 Realtime Racing NSX (2002)
Integra Type-R (2001)
NSX (1997)
NSX (2005)
RL A-Spec (2006)
RSX Type-S (2002)
VIS Racing Integra Type-R (2000)

BUICK
Regal GNX (1987)

CADILLAC
# 6 Team Cadillac Northstar LMP-02 (2002)
#16 Team Cadillac CTS-V (2004)
CTS-V (2004)

CHEVROLET
# 3 Corvette Racing C5.R (2004)
# 4 Compuware Corvette C6.R (2006)
#31 Whelen Engineering Corvette Z06 (2005)
#73 3R-Racing Corvette Z06 (2003)
#99 Tiger Racing Corvette Z06 (2005)
Camaro SS (2002)
Camaro SS Coupe (1969)
Camaro Z28 (1969)
Chevelle SS 454 (1970)
Cobalt SS Coupe (2005)
Corvette Grand Sport (1996)
Corvette Guldstrand Edition (2003)
Corvette Sting Ray 427 (1967)
Corvette Z06 (C5) (2002)
Corvette Z06 (C6) (2006)
Corvette ZR-1 (1970)
Lingenfelter 427 CID Twin Turbo Corvette (2002)

CHRYSLER
Crossfire SRT6 (2006)
Eagle Talon TSi Turbo [1998]
ME Four-Twelve Concept (2005)
Plymouth Barracuda Formula-S [1968]
PT Cruiser GT (Turbo) (2004)

DODGE
# 1 Team Zakspeed Viper GTS-R (2002)
#126 Team Zakspeed Viper GTS-R (2003)
#22 3R-Racing Viper Competition Coupe (2004)
#23 Magellan Financial Viper Competition Coupe (2003)
#57 Carsport Holland Viper GTS-R (2000)
#58 Larbre Compétition Viper GTS-R (2001)
#77 Team Zakspeed Viper GTS-R (2005)
Charger R/T-SE (1969)
Charger SRT8 (2006)
Hennessey Viper 800TT (2000)
SRT4 (2003)
Stealth R/T Turbo (1996)
Viper Competition Coupe (2003)
Viper GTS ACR (1999)
Viper SRT10 (2003)

FORD
#10 Tiger Racing Mustang (2004)
Focus ST (2006)
Focus SVT (2003)
FocusSport SVT Focus (2003)
Ford GT (2005)
GT40 Mk II (1966)
Mustang Boss 429 (1970)
Mustang GT (2005)
SVT Mustang Cobra R (2000)

INFINITY
G35 Coupe (2003)

LEXUS
Foose Design IS430 Project Car (2003)
IS300 (2003)
IS350 (2006)
SC430 (2002)

PANOZ
#11 JML Team Panoz LMP-01 (2003)
#51 JML Team Panoz Esperante GTLM (2005)
#81 Team LNT Panoz Esperante GTLM (2006)
Esperante GTLM (2005)

PONTIAC
GTO (2004)
GTO Hardtop [1968]
Solstice (2006)

SALEEN
# 2 Konrad Motorsports S7R (2003)
#11 Graham Nash Motorsport S7R (2002)
#26 Konrad Motorsports S7R (2001)
S281 (2000)
S7 (2004)

SATURN
ION Red Line (2006)

SCION
tC (2005)

SHELBY
Cobra 427 SC (1965)
GT 500 (2007)
Mustang GT-500KR [1968]
Series 1 (1999)