Easiest method if you suck at this game(which I do) is to go to career mode. Next, go to season and pick police car. Pick the Blue Star as the objective is 18th or better(so only have to finish ahead of two cars). Go to the oval tracks and pick the USA track on the bottom. Make this the only track you pick and continue. Here at settings(1/2), I use two laps in case I'm farther back in the pack after one. No Qualifying. Now on settings 2/2 ... make sure Boost is on and have AI set to the lowest hard setting which is 80.
For me, I tried not to use the boost until near the end of the first lap initially. So you need to be at least in the middle of the pack. Once you cross the finish line for lap one the boost refreshes. By here you should be in good shape in terms of your position.
Now it's just using boost in lap two smart and don't go off track.
If you can ... use small bursts of the boost to get more out of it.
This should unlock the basic team objective achievement for this. FYI doing this on ultimate first will unlock all 3 achievements.