This achievement is VERY easy, it doesn't even require any racing, or even another person present. Just make sure you have another controller that's semi functional to be able to select a car using the A button. My second pad is very ill :(
At the main menu, select Quick Race using the left stick on your main player pad (D-Pad can't be used here strangely), select any track and difficulty. You'll see Y can be used to change difficulty in the top right corner of the screen.
Press A. Select a car for your main player hitting A on it, then press A on your second controller, choose any car, hit A again.
The achievement unlocks as soon as the race starts, no actual racing needed. Your first easiest 10G of the game!