Quest objectives
Eliminate 20 PMC operatives in the eastern part of Lighthouse
How to complete the quest?
It is necessary to kill PMCs at the Lighthouse in a certain area (Highlighted below). At this moment the killzone is expanded up to the Water Treatment bridge, so it's up to you if you want to camp, or run around hunting PMCs on their spawns.
Assesment. Part 1. Killing zone.
Assesment. Part 1. Killing zone.