Hello and welcome to my "Rex Sword" Achievement Guide (10G)

For this achievement you need to locate and grab the energy sword on outskirts.

In order to do this, Start the mission outskirts on any difficulty.

For this achievement, you'll have to quite a bit of roof running using the "out of map" method at the beginning of the level. It is a lot to explain using only text, so the video is recommended. You'll have to use the light fixture in the doorway to crouch-jump onto the roofs above. From there, you'll have to navigate the rooftops across the map, onto a bridge, where you must grenade jump onto another building. From there continue forward and you'll notice the rooftop of one of the buildings has a hole in it, where you can drop down and find the "Rex Sword" with infinite ammo.

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Video Tutorial (Recommended)