Red Faction: Armageddon

Story related, can't be missed

First up, you have to place a targeting beacon by pressing and holding  on the marker that's near your starting position. After it's placed, you have to defend the area whilst the Orbital Cannon acquires its' first target. After killing a few Cultists you will be told to fire the Orbital Cannon. Do this by pressing and holding  on the targeting beacon. Once the shield on the left hand Tower is down, press  to select your Charge Launcher, then empty the magazine into the Tower and press  to detonate the charges and destroy it.

On your way to Tower 2 you will face a lot of Cultists, Turrets, and 2 Sheva Mechs so be careful. The first Sheva Mech is directly in your path whilst the other one is on the bridge that's towering above you. The area where you have to place the beacon is crawling with Cultists; make use of the available cover and the Turrets to clear a path. This beacon is a little fiddly to place so you may have to move around a bit to find the right spot. Once it's placed you have to defend the area until the Orbital Cannon is ready to fire. The Cultists that appear are armed with Nano-Tech weapons so use your Nano Forge (hold ) to repair any cover they destroy. After a couple of minutes, will be able to fire the Orbital Cannon. Once the Tower's shield is down you, can destroy the Tower but afterwards you will be informed that the Orbital Cannon is malfunctioning and has targeted that area for destruction. You will have approx 10secs to avoid dying so run like crazy into the nearby tunnel.

Inside the tunnel you will face lots of Cultists, Turrets and a Sheva Mech. Once at the other end of the tunnel, you will be informed that some Red Faction soldiers are pinned down and need assistance. In the next area you will face more Sheva Mechs and Turrets but move carefully and take out every enemy you see. Eventually you will find the third and final tower. Place your Shard Cannon in the designated spot by pressing and holding  but you only have a limited time to do this as the Orbital Cannon is still malfunctioning and will kill you if you don't finish the level quickly. The trophy will pop during the cutscene at the end of the level.