very tricky achievement but there are a few tips to make it easier.
Go to Options
set AIM ASSIST to HIGH
As soon as the fight starts run to the trunk of your car and select the machine gun.
Remeber to press
to reload STrategy
A total of 4 cars pull up but ignore the first one it pulls up straight away, focus on changin your weapon. After selecting the machine gun, stay behind your car, DONT RUN INTO AIRBASE. Pick off 1 or 2 enemies, but wait for a car to come down the main road, with aim assist to high you will easily kill him
Now run into airbase and head behind a truck, 1 car will come from the left and one from the right, from behind the truck you will be protected from any fire and have a prime position to take the drivers out. Focus on the 1 from the left first, if you fail you should be able to get the 1 from the right.
If all cars have pulled up and the achievement has not unlocked allow 1 of the enmies to kill you, if you restart you have to play from the burning house.