1. Win the GT World Championship: This unlocks the following cars:
* McLaren F1 LM
* Dallara F399
* Sauber C9
* Mazda 787B
* Toyota GT-One
2. Win the GT Championship Europe: This unlocks the following cars:
* Ferrari F40LM
* Bugatti EB110
* Porsche 911 Turbo S
* Lamborghini Diablo SV
* Viper GTS-R
3. Win the GT Championship USA: This unlocks the following cars:
* Corvette C5-R
* Saleen S7
* Dodge Viper GTS-R
* Ford GT90
* Panoz Esperante GTR-1
4. Complete the Driving Tests: This unlocks the following cars:
* Ferrari F50
* Lamborghini Diablo 6.0 VT
* Nissan R390 GT1
* Toyota GT-One
* Dodge Viper GTS-R
5. Get the "Super License": This unlocks the following cars:
* Audi R8R
* BMW V12 LMR
* McLaren F1 GTR Long Tail
* Peugeot 905 Evo 1bis
* Porsche 911 GT1
By completing all of these challenges, you will unlock every car in *Grand Turismo 2* for the PlayStation 1, except the McLaren F1 GTR.