Since no one else is doing it as far as I know, I'm going to start a list of prize cars and the events you need to complete to win them
I'll start with the few I know off the top of my head and will edit the OP with any others you guys give me. Okay...
*the (P) or (S) denotes Premium or Standard car.
License Tests
B License Gold: TommyKaira ZZ-S '00 (S)
*plus silver and bronze prizes
B License Silver: Daihatsu OFC-1 Concept '07 (P)
*plus bronze prize
B License Bronze: Mazda Demio Sport '03 (S)
A License Gold: Isuzu 4200R '89 Concept (P)
*plus silver and bronze prizes
A License Silver: Mazda Atenza Concept '01 (S)
*plus bronze prize
A License Bronze: Nissan mm-R Cup Car '01 (S)
IC License Gold: Nissan GT-R Concept (Tokyo Motor Show 2001) (S)
*plus silver and bronze prizes
IC License Silver: Autobacs Garaiya '02 (S)
*plus bronze prize
IC License Bronze: Acura DN-X Concept '02 (S)
IB License Gold: Honda S800 RSC Race Car '68 (S)
*plus silver and bronze prizes
IB License Silver: Mitsubishi HSR-II Concept '89 (S)
*plus bronze prize
IB License Bronze: Mazda Eunos Roadster J-LIMITED (NA) '91 (P)
IA License Gold: Ford GT (No Stripe) '05 (S)
*plus silver and bronze prizes
IA License Silver: Land Rover Range Stormer Concept '04 (S)
*plus bronze prize
IA License Bronze: Dodge RAM 1500 LARAMIE Hemi Quad Cab '04 (S)
S License Gold: Nissan GT-R Spec-V (GT Academy Version) '09 (P)
*plus silver and bronze prizes
S License Silver: Mazda MX-Crossport Concept '05 (S)
*plus bronze prize
S License Bronze: Opera Honda S2000 '04 (S)
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Special Events
Karting Gran Turismo Easy: Horn
Karting Gran Turismo Intermediate: Paint Color
Karting Gran Turismo Advanced: Paint Color
Jeff Gordon NASCAR School Easy: The oval at Indianapolis and Daytona are available in Arcade Mode and Training.
Jeff Gordon NASCAR School Intermediate: None
Jeff Gordon NASCAR School Advanced: None
Jeff Gordon NASCAR School All Gold: NASCAR
*plus silver and bronze prizes
Jeff Gordon NASCAR School All Silver: Modern Muscle Car
*plus bronze prize
Jeff Gordon NASCAR School All Bronze: Classic Muscle Car
Top Gear Test Track Easy Gold: Top Gear Test Track available Arcade and Practice
Top Gear Test Track Intermediate Gold: Lotus Elise Type 72 '01 (S)
Top Gear Test Track Advanced Gold: Jaguar XFR '10 (S)
Flight Academy Mercedes-Benz AMG Easy Gold: Winter Ahrweiler In Photo Travel
Flight Academy Mercedes-Benz AMG Easy Silver: Ahrweiler Gate In Photo Travel
Flight Academy Mercedes-Benz AMG Easy Bronze: Ahrweiler Street In Photo Travel
Flight Academy Mercedes-Benz AMG Intermediate Gold: Mercedes CLK-GTR RACE CAR '98 (S)
Flight Academy Mercedes-Benz AMG Intermediate Silver: Nürburgring 4hr layout available in Arcade and Practice
Flight Academy Mercedes-Benz AMG Intermediate Bronze: Nurburgring Nordschleife avaiable in Arcade and Practice
Flight Academy Mercedes-Benz AMG Advanced Gold: Mercedes-Benz SLS AMG '10 (P)
*plus silver and bronze prizes
Flight Academy Mercedes-Benz AMG Advanced Silver: Mercedes-Benz C 63 AMG '08 (P)
*plus bronze prize
Flight Academy Mercedes-Benz AMG Advanced Bronze: Mercedes-Benz A 160 Avangarde '98 (S)
Flight Academy Mercedes-Benz AMG Expert Gold: Mercedes-Benz SLR McLaren '03 (S)
*plus silver and bronze prizes
Flight Academy Mercedes-Benz AMG Expert Silver: Mercedes-Benz SL 65 AMG (R230) '04 (S)
*plus bronze prizes
Flight Academy Mercedes-Benz AMG Expert Bronze: Mercedes-Benz SLK 230 Kompressor '98 (S)
Rally Gran Turismo Easy Gold: Roadgoing Rally Car
Rally Gran Turismo Intermediate Gold: WRC Style Rally Car
Rally Gran Turismo Advanced Gold: Historic Rally Car
Grand Tour
After 1 event: Lucerne - Chapel Bridge In Photo Travel
After 2 events: Siena, Piazza del Campo In Photo Travel
After 3 events: Main Square of San Gimignano In Photo Travel
After 4 events: Abbey of San Galgano In Photo Travel
Sebastien Loeb Rally Challenge Gold: Citroën C4 WRC '08 (P)
*plus silver and bronze prizes
Sebastien Loeb Rally Challenge Silver: Citroën C4 Coupe 2.0 VTS '05 (P)
*plus bronze prize
Sebastien Loeb Rally Challenge Bronze: Citroën C3 1.6 '02 (S)
Red Bull X1 Challenge Gold: Red Bull X2010 Prototype (P) (naked carbon)
*plus silver and bronze prizes
Red Bull X1 Challenge Silver: Red Bull X2010 (P) (plain color)
*plus bronze prize
Red Bull X1 Challenge Bronze: Red Bull X2010 S.Vettel (P) (Red Bull livery)
*unlocked at level 30
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A-Spec
A-Spec Beginner
Sunday Cup: Toyota Vitz U euro Sport Edition’00 (S)
FF Cup: Honda Honda Civic SiR-II (EG) ‘91 (S)
FR challenge: Toyota FT-86 Concept ’09 (P)
European Classic Car Championship: Volkswagen Kubelwagen typ82 ‘44 (P)
World Classic Car Series: Subaru 360 ‘58 (S)
Light Weight K Cup: Suzuki Wagon R RR ‘98 (S)
Vitz race: Toyota Prius G Touring Selection (J) ‘03 (S)
World Compact: Hommell Berlinette R/S Coupe ‘99 (S)
Japanese Classics: Honda Z ACT ’78 (S)
Beginner events complete: Gift Car Ticket Level 5
A-Spec Amateur
Clubman Cup: Honda Mugen Motul Civic Si Race ‘87 (S)
European Hot Hatch Championship: Volkswagen Lupo GTI Cup Car (J) ‘03 (S)
NR-A Roadster Cup: Mazda KUSABI CONCEPT ’03 (S)
Sport Truck Race: Daihatsu Midget II D type ‘98 (S)
Japanese 90's Challenge: Nissan SILEIGHTY ‘98 (S)
Tous France Championship: Citroën 2 CV Type A ‘54 (S)
Festival Italia: Alfa Romeo Giulia Sprint GTA 1600 ‘65 (S)
Classic Muscle Car Championship: Buick Special '62 (S)
Supercar Nostalgia Cup: Dome Zero Concept ’78 (S)
Amateur events complete: Gift Car Ticket Level 9
A-Spec Professional
Mini Challenge: Mini Cooper 1,3i ‘98 (S)
Muscle Car Championship: Dodge Challenger SRT8 ‘08 (P)
Supercar Festival: Maserati Gran Turismo S ’08 (P)
la Festa Cavillino: Ferrari California ‘08 (P)
British Lightweight: Triumph Spitfire 1500 ‘74 (S)
Lamborghini Exclusive: Lamborghini Countach LP400 ‘74 (S)
Lupo Cup: Volkswagen Lupo 1,4 ‘02 (S)
Japanese 80's Festival: Toyota Celica XX 2800GT ’81 (S)
GT World Championship: Bugatti Veyron 16.4 ‘09 (S)
Professional events complete: Gift Car Ticket Level 12
A-Spec Expert
Tuning Car Grand Prix: HPA Motorsport Stage II R32 (S)
Schwarzwald League A: Opel Speedster Turbo ‘00 (S)
Historic Racing Car Cup: Lancia STRATOS Rally Car '77 (S)
Trofeo Gallardo: Lancia Delta S4 Rally Car '85 (S)
MR Sports Cup: Cizeta V16T '94 (S)
Turbo Race: Mitsubishi Lancer EX 1800GSR IC Turbo '83 (S)
Japanese Championship: Gran Turismo 350Z RS (P)
Gran Turismo All Stars: AMUSE Carbon R (R34) '04 (S)
Polyphony Digital Cup: Nissan 350Z Gran Turismo 4 Ltd (Z33) '05 (S)
Expert events complete: Gift Car Ticket Level 17
A-Spec Extreme
NASCAR Series: Pontiac Tempest Le Mans GTO (S)
Schwarzwald League B: Audi Pikes Peak Quattro Concept '03 (S)
Like The Wind: Minolta 88C-V '89 (S)
Super GT Series: Calsonic Skyline GT-R race car '93 (S)
DTM Series: BMW 2002 Turbo '73 (S)
Dream Car Championship: Ford GT LM Race Car Spec II (S)
American Championship: Jay Leno Tank Car ‘03 (S)
European Championship: Audi Le Mans quattro ‘03 (S)
Formula GT: Caterham Fireblade (S)
Extreme events complete: Gift car ticket level 21
A-Spec Endurance
Grand Valley 300km: Honda HSC '03 (S)
Roadster 4 hours: Mazda 110S '68 (S)
Laguna Seca 200 miles: Infinity Coupe Concept '06 (P)
Indy 500: XJ13 Race Car '66 (P)
Suzuka 1000km: Nissan GT-R Concept LM race car (S)
Nurburgring 4h: Audi R8 LMS Race Car '09 (S)
Tsukuba 9h: HKS CT230R '08 (P)
Le Mans 24h: Audi R8 Race Car (Audio Playstation Team Oreca) ´05 (S)
Nurburgring 24h: Audi R10 TDI '06 (P)
Endurance Events Complete: Gift Car Ticket Level 24
----------------------------------------------------
B-Spec
B-Spec Beginner
Sunday Cup: Toyota Yaris U Euro Sport Edition (J) '00 (S)
FF Cup: Honda Civic TYPE R (EK) '97 (P)
FR Challenge: Toyota FT-86 G Concept'10 SPORTS (P)
European Classic Car Championship: Fiat 500 F '65 (S)
World Classic Car Series: Volkswagen Beetle 1100 Standard (Type-11) '49 (S)
Light Weight K Cup: Daihatsu Move SR-XX 4WD'97 (S)
Vitz Race: Toyota Prius G '09 (P)
World Compact Car Race: Autobianchi A112 Abarth '79 (S)
Japanese Classics: Isuzu 117 Coupe '68 (S)
Beginner events complete: Gift Car Ticket Level 5
B-Spec Amateur
Clubman Cup: TRD Celica TRD Sports M (ZZT231) ‘00 (S)
Euro Hot Hatch League: Volkswagen Lupo Cup Car ‘00 (S)
NR-A Roadster Cup: Mazda Furai Concept’08 (S)
Sport Truck Race: Daihatsu Midget II D type '98 (S)
Japanese 90's Challenge: Mazda 323F ‘93 (S)
Classic Muscle Car Championship: Shelby AC Cobra 427 ‘66 (P)
Festival Italia: Alfa Romeo Giulia Sprint Spéciale ‘63 (S)
Supercar Nostalgia Cup: DMC DeLorean S2 ‘04 (S)
Tous France: Alpine A110 1600 ‘73 (S)
Amateur events complete: Gift Car Ticket Level 9
B-Spec Professional
Mini Challenge: MARCOS Mini Marcos’70 (S)
Muscle Car Championship: Ford Mustang GT '05 (S)
Supercar Festival: Hyundai Clix Concept '01 (S)
Lupo Cup: Volkswagen Lupo GTI '01 (S)
Japanese 80's Festival: Isuzu PIAZZA XE '81 (S)
la Festa Cavillino: Ferrari F40 '92 (P)
British Lightweight: Lotus Elan S1 '62 (S)
Lamborghini Exclusive: Lamborghini Countach 25th Anniversary '88 (S)
GT World Championship: Pagani Zonda R '09 (P)
Professional events complete: Gift Car Ticket Level 12
B-Spec Expert
Tuning Car Grand Prix: AEM Honda S2000 (P)
Schwarzwald League A: Opel Speedster '00 (S)
Historic Racing Car Cup: Alfa Romeo GIULIA TZ2 carrozzata da ZAGATO CN.AR750106 ‘65 (P)
Trofeo Gallardo: Lancia Stratos '73 (S)
MR Sports Cup: Cadillac CIEN Concept '02 (S)
Turbo Race: Honda City Turbo II '83 (S)
Japanese Championship: Opera Performance 350Z (S)
Gran Turismo All Stars: NISMO 380RS Super Leggera (P)
Polyphony Digital Cup: Gran Turismo Skyline GT-R '01 (S)
Expert events complete: Gift Car Ticket Level 17
B-Spec Extreme
Schwarzwald League B: Nuvolari Quattro '03 (S)
Like The Wind: Toyota 7 Race Car '70 (S)
B-Spec NASCAR Extreme: Mercury Cougar XR-7 '67 (S)
European Championship: BMW Concept 1 Series tii '07 (P)
Super GT: Toyota Castrol TOM's Supra '97 (P)
German Touring Car Championship: Audi Quattro '82 (S)
American Championship: Chevrolet SSR '03 (S)
Formula GT: Suzuki GSX-R/4 Concept '01 (S)
Dream Car Championship: GT by Citroen Race Car (P)
Extreme events complete: Gift Car Ticket Level 21
B-Spec Endurance
Grand Valley 300km: Honda DUALNOTE Concept '01 (S)
Roadster 4 hours: Mazda 110S (L10A) '67 (S)
Laguna Seca 200 miles: Camaro IROC-Z Concept '88 (S)
Indy 500: Ford GT40 Race Car '69 (S)
Suzuka 1000km: Nissan Fairlady Z-Concept LM Race Car (S)
Nurburgring 4h: Lexus IS F Racing Concept ‘08 (P)
Tsukuba 9h: Amuse S2000 GT1 ‘04 (S)
Le Mans 24h: Toyota GT-One Race Car (TS020) (S)
Nurburgring 24h: McLaren MP4-12C '10 (P)
Endurance Events Complete: Gift car Ticket Level 24
B-Spec Level 35: Red Bull X2010 S.Vettel (P) (Red Bull livery)
Please contribute
constructive criticism is welcomed