STORY and
UNMISSABLEYou will get this trophy after defeating Nemesis for first time at the rooftop of the Construction Site.
For the first part of the fight, focus on the gas tank on his back, trying to keep your distance out of the flamethrower and any physical attacks. Use the electricity generators in a timely manner to stun him momentarily and continue to attack.
Once you destroy the gas tank, nemesis will start attacking you more directly and ramming you from time to time. Use your surroundings to take cover and attack on his weak spots when you get the chance.
Below is a video showing you how to accomplish this during your first runs and without using the Infinite Rocket Launcher.