This is the 7th story progression achievement.
*** Spoiler - click to reveal ***After completing ‘Benefactor’ you’ll be told that one of your friends is missing, and the ‘Fly Trap’ mission will begin. Get to their last known location then follow the marker to wind up in Charter Hill. After getting to your objective you’ll have to make your way down to street level to find a power switch. Turn it off and return to the rooftops. You’ll then have to get back to the Zephyr Transit hideout then follow the marker out through an upstairs window which will lead you to a fight against a bunch K-Sec including a new enemy type. Once they’re defeated you’ll be pursued by a drone. Follow the marker and keep running towards the Centurian Yards hideout to outrun it. The achievement will pop once you get back there.