Propaganda Posters: 1
As soon as the mission starts, open your nanovisor to tag the collectibles along the way. Right in front of you is the first blackbox of the mission, and a few steps away from it is a propaganda poster. Above the poster is a wreckage where a datapad and ammo crate is found. Continue forth and you'll find another blackbox beside the corpse in the bus wreck.
First few collectibles of the last mission
Continue along the path and you'll find another blackbox, past the ledge where you need to climb up.
Continue along this straightforward path until you reach a large, bright cavern. Take the path to the left and go around the metallic platform as you make your way to the right. From there, you'll find a stash of ammo, weapon, nanosuit upgrade and a datapad.
Proceed to the next cavern and head to the objective. Take care not to get damaged too much since you can't still use the suit's armor and stealth abilities. It will help hacking the citadel turret to make your job a lot easier. Head to the mind carrier and mount it. You'll be supercharged and more enemies will appear. Take them out and proceed to the next objective.
On your way to the next objective, you'll come across another CELL weapon cache and more supplies. You'll find a blackbox in an open empty case.
There will be two paths here; the shortest one is the path to the left while the path to the right, along the stream is longer but will lead you near the game's last collectible. Follow the path until you reach a large cavern. Open your nanovisor to find this datapad on the lower ground, near the vehicle wreckage.
While there, you can complete one of the secondary objectives, which is to investigate the CELL beacon. The beacon is on top of the APC. There's a pinger in the area which you can destroy using the scattered JAW anti-tank launchers or the APC's mounted cannon. You can also activate the inactive CELL drones on the ground.
Continue to the the mindcarrier to the north and mount it. You'll be supercharged again so make your way to the second mindcarrier while taking out enemies with ease. A ceph turret guards the way to the last mindcarrier. You can destroy it with powerful explosive weapons like the LTAG or X-PAC Mortar or you can complete the secondary mission which is to disable the cooling structure. The console is located in the lower path, under the turret. This turret can't be hacked as well.
Proceed to the last mindcarrier and you'll be supercharged for the duration of the mission. The best weapon in this mode is the X-PAC Mortar as it can easily take out groups of enemies. Keep killing enemies while in this mode to unlock the achievement “Post-Human Warrior” and “Taste of your Own Medicine”
Head to the wormhole and face the Alpha Ceph. The battlefield has several weapons, drones and a tank that you can use for extra firepower. When dealing with the Alpha Ceph, it will be easier using the X-Pac Mortar on it. Just stay close to a ceph energy cell to supercharge yourself and have infinite ammo for a short duration. After dealing considerable damage, the Alpha Ceph will draw you in. Mash the A button to break free and repel the energy.
After damaging the Alpha Ceph, more enemies will appear. Take them out and the Alpha Ceph will appear once again. Repeat the same process until you deal the finishing blow.
Once you've commandeered Archangel, use the right analog stick to carefully and steady your aim. Once you get a steady lock, press and hold the fire button to release Archangel's remaining stored energy and destroy the massive ceph warship. Game completed.