To
get the Secret Collector 4 achievement you will need to get all the cars in the game.
Use auction house to buy these cars:
USA
Level 5 - 1968, Shelby, Mustang GT-500KR
Level 10 - 1969, Dodge, Charger R/T-SE
Level 15 - 1970, Chevrolet, Chevelle SS-454
Level 20 - 2000, Ford, Mustang Cobra R
Level 25 - 1996, Chevrolet, Corvette Grand Sport
Level 30 - 1999, Dodge, Viper GTS ACR
Level 35 - 2005, Chevrolet, #31 Whelen Engineering Corvette Z06
Level 40 - 2005, Panoz, #51 JML Team Panoz Esperante GTLM
Level 45 - 2002, Saleen, #11 Graham Nash Motorsport S7R
Level 50 - 2002, Cadillac, #6 Team Cadillac Northstar LMP-02
EUROPE
Level 5 - 1961, Jaguar, E-type S1
Level 10 - 1974, Lancia, Stratos HF Stradale
Level 15 - 1982, Porsche, 911 Turbo 3.3
Level 20 - 1989, Lotus, Carlton
Level 25 - 1987, Porsche, 959
Level 30 - 1998, Ferrari, F355 Challenge
Level 35 -2005, Porsche, #3 Lechner Racing School Team 1 911 GT3 Cup
Level 40 - 2005, BMW Motorsport, #2 BMW Motorsport M3-GTR
Level 45 - 1997, McLaren, #41 Gulf Team McLaren F1 GTR
Level 50 - 2002, Audi, #1 Infineon Audi R8
ASIA
Level 5 - 1969, Nissan, Fairlady Z 432R
Level 10 - 2004, Mitsubishi, Lancer Evolution VIII MR
Level 15 - 1998, Subaru, Impreza 22B STi
Level 20 - 2002, Nissan, Skyline GT-R V-Spec II Nür
Level 25 - 2002, Mazda, RX-7 Spirit R Type-A
Level 30 - 2005, Honda, NSX-R GT
Level 35 - 2003, Subaru, #77 CUSCO SUBARU ADVAN IMPREZA
Level 40 - 2006, Toyota, #25 ECLIPSE ADVAN SUPRA
Level 45 - 1998, Nissan, #32 NISSAN R390 GT1
Level 50 - 1999, Toyota, #3 Toyota Motorsports GT-ONE TS020
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