Here is the full list of all 10 Kanjozoku Game Racer achievements worth 1,000 gamerscore.
Buy your first car at a car dealership
Paint your car in a special color
Change the wheels on your car
Stylize your car
Travell 50 km on the road in one run
Improve the power of your car by 250hp
Experience the thrill of your first race
Increase your savings amount by 250k
Sell one of your car
Increase engine power to the maximum