Project Cars

Quick Race Weekend, track- California Highway Full, car- Caper Monterey Stockcar, opponents- I set 5, grid position- player first, opponent skill- 100!
When race starts, pause and press Simulate Remainder Of Session (you must be in first place), but DO NOT PRESS Skip To End Of Session!!!
Spectate or stay in menu and after 7min 30 sec you will unlock your achievement!
Note: credit goes to II SkyLander II for telling me this!

Achievement- Run the California Highway Full (20.54km) (12.83mi)in 9minutes or less.
Hi, I just wanted to add a quick how to guide on this achievement, Firstly you can go to Quick Race Weekend and choose a track and car of your choice.
After scrolling through the US cars in the game I came across the FordMkIV 1967, Its quite fast (223mph) After a run or two around the track i was able to do 8.54 and unlock the achievement and i don't consider myself good at racers so this is doable for anyone Also i was threading carefully around the track because the car doesn't handle the best, Although saying that at first glance it looks like the fastest US car in the game, Its also worth noting you may Want to go in to you're Authenticity Settings go to the bottom and turn Flags & Penalties Off, I don't know if it actually matters but i did it just incase, To change settings From main menu press RB go to options & Help - Gameplay. As i said if I can do it anyone can, its not that bad.

EDIT: It seems that if you attempt this in Time trial it does not unlock So do it in Quick Race as stated above, Thank you to Superschscrubber, for this information.

Another thing worth knowing is that it looks like there are even better cars which can be used than the one I mentioned, these include the Ford Mustang transam and the Caper Mustang Stockcar, Thank you to BurnNotice89 & Ou7ofSync

Good luck

We did it online.
Just pick the Caper Monterey Stockcar and go on.
I crashed a few times but got the achievment at the end with sth like 8:00:00

hey guys i made a video guide for you guys that prefer them :)
pretty simple achievement you can just simulate it all

There are probably a couple of cars suitable for this. I drove the 2012 Ford Mustang Boss. Maybe not the fastest car but it drives really good.
Set up a Single Player race. It might be handy to use the racing line because of the first part , that has many corners and it could be useful to see where to brake in this part of the track ( you can set - up your options by pressing in the menu where you select the track and car ) The mini map can also help you in the second part of the track. Easy A.I. is also recommended. With this setting you pull away very quickly and they don't bother you the rest of the race by crashing into you.

Take your time in the first part of the track and use the racing line colours to brake when needed. The first part of the track has many corners and you could lose time easily when you bump in every corner. The second part of the track has got very long straights and that is where you make up your time.
Don't be discouraged when you see that halfway you have about 3 minutes left. As I said , the second part of the track is the easy part and you can put the pedal to the metal here. From the moment you turn on the highway towards the bridge you can relax a bit , the hard part of the track is over. There are a couple of jumps later on where the racing line wants you to brake , ignore them or if you want to be sure , a quick look at the minimap gives you a good impression of what to come but most of them can be taken flat out.
With this setting I did it in 8 minutes and some seconds in my first try on this track so even a couple of bumps are allowed I guess.
So be patient in the first part , you make up your time in the second part of the track. Overall , very easy to do.
Good luck !!

Easy acheivement use the Caper Monterey Stockcar aka 1990 Chevrolet Lumina penalties off and you should run between a 8:10:00 to a 8:20:00

Did it in the stock car, solo race, 1 other competitor. Multiple spin outs, cut track notifications and hit a few walls, still managed 8:04 time. Easy as pie!