Complete the indicated task to unlock the corresponding car.
| Unlockable: | How to Unlock: |
| Bonecracker (Derby) | Earn a Gold medal in the Bonecracker Demolition Derby. |
| Bullet, Lentus and Ventura (Race) | Complete the Race Class Stage 2 with a Bronze or better medal. |
| Canyon (Street) | Earn a Gold medal in the Canyon Beat The Bomb Race. |
| Crusader (Street) | Earn a Gold medal in the Crusader Deathmatch Derby. |
| Flatmobile (Special) | Earn a Gold medal in the Flatmobile Beat The Bomb Race. |
| Grinder (Derby) | Earn a Gold medal in the Grinder Demolition Derby |
| Insetta (Race) | Earn a Gold medal in the Insetta Carnage Race. |
| Lancea, Daytana and Fortune (Race) | Complete the Race Class Stage 1 with a Bronze or better medal. |
| Mob Car (Special) | Earn a Gold medal in the Mob Car Carnage Race. |
| Road King (Street) | Earn a Gold medal in the Road King Beat the Bomb Race. |
| Shaker, Blaster XL and Banger (Derby) | Complete the Derby Class Stage 1 with a Bronze or better medal. |
| Sparrowhawk, CTR Sport and Vexter XS (Street) | Complete the Street Class Stage 1 with a Bronze or better medal. |
| Speedshifter, Terrator, Speeddevil, Bullet GT and Sunray (Street) | Complete the Street Class Stage 2 with a Bronze or better medal. |
| Splitter, Switchblade and Venom (Derby) | Complete the Derby Class Stage 2 with a Bronze or better medal. |
| Truck (Special) | Earn a Gold medal in the Truck Deathmatch Derby. |
Complete the following achievements to unlock Microsoft Gamerscore points.
| Unlockable: | How to Unlock: |
| Bang'n'Slam (10) | Get 5 Slams in one race. |
| Bomb Car Racer (20) | Complete all Beat the Bombs in Carnage Mode with all gold. |
| Burnin' Up (20) | Burn nitro continuously for at least 10 seconds in a normal race. |
| Car Rental Service (40) | Own at least 6 vehicles at the same time. |
| Carnage Master (30) | Complete Carnage Mode. |
| Carnage Wizard (40) | Complete Carnage Mode with all gold. |
| Crashman Returns (30) | Win all Bonus Race Single Events with the Flatmobile. |
| Derby Expert (20) | Complete all derbies in FlatOut Mode with all gold. |
| Elite Stuntman (20) | Complete all the Stunts in Carnage Mode with all gold. |
| Fragman (20) | Complete all the Deathmatch Derbies in Carnage Mode with all gold. |
| Fragmaster Live (20) | Get a frag streak of 5 or more in an online Deathmatch Derby. |
| Give Me Glory (20) | Get 1 million points in the Carnage Mode. |
| Go That Extra Mile (40) | Drive a total distance of 1001 miles. |
| Holy Slammaster (15) | Get 100 Slam crash bonuses. |
| Hostmaster (10) | Host 10 online matches. |
| Insane Air (20) | Jump at least 10m high with your car on a Carnage or normal Race. |
| Keep on Truckin' (15) | Win 15 Derbies. |
| Lightning Fast (15) | Get the fastest lap of the race in 50 races. |
| Live Ammunition (30) | Wreck 10 opponents in online races. |
| Live to Crash (25) | Wreck 3 or more opponents in the same online race (normal or Head-On). |
| Live to Race Clean (25) | Complete an online Race without crashing into anyone, and without ragdolling at all. |
| Master Stuntman (15) | Complete all the Stunts in Carnage Mode with silver or better. |
| Master Trucker (10) | Win a Head On or normal race with the Truck. |
| On a Roll (20) | Complete your first class in the FlatOut Mode. |
| Online Derby Pro (20) | Win 20 ranked online Derbies. |
| Online Derby Veteran (10) | Win 10 online Derbies. |
| Online Race Pro (20) | Win 25 ranked online Races. |
| Online Race Veteran (10) | Win 10 online Races. |
| Online Stunt Pro (20) | Win 30 ranked online ragdoll Stunts. |
| Online Stunt Veteran (10) | Win 10 online ragdoll Stunts. |
| Pro Racer (20) | Complete all Time Trials in FlatOut Mode with all gold. |
| Pro Tuner (25) | Own a fully upgraded Street class car in FlatOut Mode. |
| Race Master (30) | Complete FlatOut Mode. |
| Race Wizard (50) | Complete FlatOut Mode with all gold in all cups and events. |
| Real Habanero (60) | Win Derby class in Flatout Mode (all cups gold) with an unupgraded Chili. |
| Schoolmaster (15) | Be the best wrecker in 50 races. |
| That's a Start (10) | Now that's a start! You've completed your first cup in FlatOut Mode. |
| Total Domination (30) | Achieve all 4 Top Driver awards in one race and win the race. |
| Used Car Salesman (35) | Sell 10 cars. |
| Windshield Breaker (15) | Get 30 Crash-Out crash bonuses. |
| Windshield Tester (15) | Get 10 Crash-Out bonuses |
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FlatOut: Ultimate Carnage Items
