Shut that doorG 5

Should/could be the first achievement you get as it's super easy. You can get this at the very beginning of the game (in the tutorial) once you gain control of your character simply run around bit and find any car with a door that is open (which should be practically all of them, target the door to take cover (Press the A button near the car) and slam that door shut with your shoulder, I got it by simply taking cover and sliding along the car from the back and the tales closes the door.