the 8-ball car pack means nothing to this cheevo as you cant race them in Grid world
Any car you can race in Grid world you can race in Race day as well and from grid world going through 'view car' you can test drive any of them also
Im sorry but the only real way to do it is more than likely run a lap (choose a small track like maybe the okutuma sprint circuit) with each car and tick them of on a piece of paper sounds g*y I know ticking them of on paper but this is what I did and I ended up getting the cheevo once I had driven all cars
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