This achievement is for completing a side object near the end of Chapter 11.
Events during this chapter will eventually lead to you making an assualt on a bar being used as an HQ by the Irish. Clear out the bar and grab all the weapons the enemies dropped, MOST IMPORTANTLY the grease gun from the guy in the back hallway leading to the next objective marker. You may also want to make sure and take the money from the register since you have none at this point.
When you've grabbed everything, pull out your grease gun, then walk out the back door that's marked. You'll see a guy get into a car and try to take off really fast. Quickly spray the driver window with your gun. Hopefully this will kill him, bringing that car to a halt and giving you this achievement.
If you aren't fast enough at shooting at him or if for some reason he lives through the barage, you can still kill him, but you must quickly get into a car and chase him down. This will likely be very difficult however as the police are highly likely to get involved. If he gets away during this chase, you loose your chance at the achievement and the chapter continues. At this point you can still pause and choose Restart Mission to begin the bar assualt again.