To first unlock Rowdy Derby you must complete career mode.

Once you have done that go to quick race and begin a Rowdy Derby on the Dover Oval track. The key to gaining points is to take down your opponents. To do so, gain lots of speed, hit focus (X) and ram into the rear or sides of other cars.

9000 points isn't much trouble once you understand how Rowdy Derby works.

Focus is basically Slow-mo, and it is used with X during a race and can be filled up by bumping cars, walls and impacts. Should come with normal progression through career.

Select career mode and begin the grind. The Amatuer Cup contains 6 races, The Pro Cup has 16 races and the final Championship has 10 races. It does not matter what place you come in as long as you finish career. But try to gain 1st, 2nd or 3rd place finishes to work toward the "Gear Head" achievement.

Performance points are earned by coming in 1st, 2nd or 3rd place in a career race. You get 1 point for each amateur cup race, 2 for the pro cup races, and 3 for each paramount cup race. If you are a good driver you should have your car maxed out near the end of the Amateur Cup.

The "paint logo" challenges are the only ones you need to focus on and work towards. The "paint style" and "number style" challenges are just shorter versions of those.

List of paint logo challenges and how to gain them:

Pass 400 cars.
This should come while completing career. Just never go to qualifying and always start at the back of the pack. Should come with normal progression through career.

Crash 100 times.
If you don't gain 100 crashes by the end of career mode start up a quick race on Dover Oval with a car without performance enhancements. Then just keep ramming back and forth between walls. Your crew chief will tell you that you need to pit but you may continue gaining crashes without worry. (A crash is when you get a different camera view and a slow-mo replay).

Take out 100 cars.
Best left until after career mode where you will have unlocked "Rowdy Derby" in quick race.
Start up a Derby and hit cars while in focus and traveling at a decent speed and you should gain a take out. Best track for this is once again, Dover Oval.

Draft for 4 minutes.
To draft you must first get in behind an opponent and you should see a wind effect coming off the car, put your car into this wind and you will gain some hammer. Should come with normal progression through career.

Use hammer 200 times.
Hammer is basically turbo, and it is used with A and can be filled by drafting, making clean laps and good pit stops. Hold down or tap A to gain 200 uses of hammer. Should come with normal progression through career.

Use hammer for 4 minutes total.
Same as above but you must hold A for a little longer then just a few taps to gain the 4 minutes need. Should come with normal progression through career.

Use focus 400 times.
Focus is basically Slow-mo, and it is used with X and can be filled by bumping cars, walls and impacts. Hold down or tap X to gain 200 uses of hammer. Should come with normal progression through career.

Use focus for 4 minutes total.
Same as above but you must hold X for a little longer then just a few taps to gain the 4 minutes need.Should come with normal progression through career.

Spend 10 minutes off road.
Some tracks have grass or dirt lining the track. This is where your car must be to gain time "off-road". Should come with normal progression through career mode.

Enter the pits 200 times.
If you complete career mode without gaining this challenge then just start up a quick race on any track, head into the pits, leave, then drive in reverse back to the pits. Doing this over and over is the best possible way to gain pit stops easily.

Race for 2 hours.
This should come with basic progression through career mode without no issues.

Hammer is basically turbo, and it is used with A during a race and can be filled by drafting, making clean laps and good pit stops. Hold down or tap A to use hammer. Should come with normal progression through career.

Please see Championship Driver achievement for more information.

Please see Championship Driver achievement for more information.

Please see Championship Driver achievement for more information.

Go to quick race from the main menu, and select Time Trial. Pick Dover Oval since it has the shortest lap times. Finish the 8 laps and the achievement is unlocked.

First complete career mode to unlock "Rowdy Derby".

Then simply go into quick race, select "Rowdy Derby".

Go to Multiplayer from the main menu, search for a match, or host one. Find someone to play with or you can set up a match and invite a friend. As long as you complete the race you will gain the achievement.