For this trophy you can only acquire it in Chapter 3, almost at the end of which you must use a rifle to escort your friend so that he arrives in the objective room.
At this point, there will be criminals that you must kill during the escort, and it is at this time that the trophy appears: you can not miss any one shot, and there are more or less 10 criminals for you to kill, that is, if you miss a shot, you must return the checkpoint.