This solution follows the same guide lines as the 10 HEAT solution.
Ok I just got this achievement and if you are like me and missed it during the tutorial then this is what you are going to have to do.
First of all mind you I was at RANK 10 when I did this if your not then you will have to work a little harder but it can be done. The Porsche I used started at heat 3.
1. You are going to need techs SHOCK WAVE and the JAMMER.
2. Start the race GULLWING its a Med difficulty race to start building up your heat and multiplier. I restarted the race until I reached heat 5.
3. Locate the repair shop on Interstate 4 you will find it at the bottom of the map, this is the shop you pass right by coming to the end of the race, keep repairing your car here do not go back to hide out warning keep restarting the race until you hit heat 5.
4. At this point try not to go to far from the repair shop, find other racers close by to get the cops to chase you.
Hit the cops with the shock wave this will build up your heat and multiplier by the time I reached heat 7-8 I found myself staying with in 100 -150 yard from the repair shop.
I would just keep running through the repair shop to keep fixing my car.
I had like 4-5 cops and a helicopter trying to take me down.
Use that Jammer and keep hitting them with the shock wave, if you can try to take out a cop or 2 this will increase your heat and multiplier quite a bit.
5. Once you reach heat 10 your multiplier should be high enough to pop the achievement for both multiplier and HEAT achievements
if not
hang in there a little longer till it pops.
Once they pop if you are feeling lucky try to make it to the hide out that is close by, its right on Interstate 4 not far from the repair shop you are using if you make it super that's an added bonus if you don't no big deal you still have your achievements
Good luck guys please leave a comment if you vote negative as to why and I will edit the solution to answer any question.
Thank you
Ed.