This is the 11th story progression achievement.
*** Spoiler - click to reveal ***After completing ‘Vive La Resistance’ take the elevator down to the tunnels and head to the marker to trigger a cutscene, after which you’ll start the next mission - ‘Payback’. You need to head to Zephyr Transit to deactivate a new security hub. There will be some turrets when you enter the Transit building as well as some guards. There’s a terminal in the middle of this entry room that will deactivate the turrets on this level so rush in to disable them before taking on the guards. Once you’ve taken care of things here jump up to the next level and run down the corridor to the Lair. Beware the turret at the far end of this corridor – move quickly and get through the door before it can lock onto you.
Make your way up and round to where the sleeping quarters are and go through the window into the open area where you fought several K-Sec during ‘Fly Trap’, and you should see the new security hub on the right of this area. There will be guards here, and 3 turrets - each with individual control terminals attached to them. Run in and quickly disable the turrets then take out the guards. Or you can try taking out some of the guards first so you don’t have as many of them running after you while attempting to disable the turrets. If you opt for this approach make sure to keep out of the turrets field of view, which can be identified by the blue lasers.
Once the turrets and guards have been dealt with disable the security hub and escape. The objective marker will have you running back to the Omnistat Tunnels, but you can lose your pursuers be getting to any hideout or safe zone on the map - several of which are much closer to you. The achievement will pop as soon as the chase ends.