This is a very easy achievement to get. Get a gun as you will need to kill the gun shop owners since they will shoot at you. Head to
East Side gun store first. Kill the owner take the money. Next head to the the gas station around the corner. Go on the little "s" shaped road heading towards China Town and head to the gun shop South in
China Town again shoot the owner. Double back on that same road take a right hit up the clothing shop and then the gas station down the road a little bit more. I got pulled over and paid a fine and still did it under 5 mins.
Here's a video from PowerPyx if you need a visual.