Hello and welcome to PBreezey's guide for The Division achievement "Fly on the Wall"
For this achievement, you will need to complete the mission "Rooftop Comm Relay," which is located in the Kips Bay area and has a minimum recommended level of 22.
This mission follows the same sequence of all of Division's other missions: enter the area, kill bad guys, complete an objective take out a boss. Once you reach the Rooftop Comm Relay, you have to protect the JTF Engineer from waves of enemies rotating in from your right and left sides while he repairs the comms. There are four waves total (right, left, right, left) with the final wave including a named elite boss for you to take down. Eliminate the boss, interact with the antenna marked on your map and the achievement is yours. With a group of four I completed this mission in roughly 20 minutes.
As with all main story missions I do recommend doing this with friends (or strangers) because: 1. It is always more fun with friends and 2. It will help you work on:
If you have any questions or comments please let me know. If you're going to downvote, please comment first and give me a chance to improve whatever issue you may have.
Good luck and happy hunting!