This is a really easy achievement to attain thanks to a little trick I know of.
If you have the option to do so, turn off the gangs. If the gangs are still around, defeat Colonel Cowell in Shai-Gen. He is located in the tower across from Wang's tower (the second largest building in the game).
After Cowell is defeated, return to his tower with a vehicle in hand. Make sure the vehicle can get inside of the building (Agency SUV works fine). Drive into the building's lobby and then drive inside of the elevator.
Once settled, exit the car and start the elevator. Now, go back inside of your car and wait. The achievement should pop up after about 5-10 seconds.