To complete Line of Duty, Arkham Knight players need to locate 16 firefighters other locations:turn annotations on for the link Batman Arkham Knight Line of Duty 'Firefighters Locations Hill can be found in Kingston, near the Gotham Herald Building, and provides a brief respite from the gun-toting criminals guarding many of the firefighters for the Line of Duty quest Batman: Arkham Knight players who complete the Line of Duty side quest score 18 upgrades and an achievement. Strangely, Firefighter Hill doesn't have much in the way of protection. Batman Arkham Knight Line of Duty 'Firefighters Locations' Guide After imprisoning Poison Ivy, speak with Aaron Cash to acquire information on 15 missing firefighters scattered across the entire.