My friends were mighty pleased with what you did, and they definitely want some more. More profit in it for you, too, as well as some extra gear, so go on, keep doing good things for good people. Ah, almost forgot. They are asking for half-masks, you know, those that Scavs hide their faces with. No idea what they need them for, to make a point or something. One more thing. This time - it should be done silently, so they won't even know what killed them, that's why you should use the silencer.
Enter the map Shoreline and search for and kill 12 Scavs whom can be found throughout the map.
Scavs can typically be found in the red marked areas during a raid:
Care should be taken when engaging Scavs at the extraction points as players may accidentally stumble on you and surprise you. This is especially true for the rock passage area since players in the resort will hear gunshots clearly and know exactly where you are.