The Chronicles of Riddick: Assault on Dark Athena

You get this achievement about half way through Assault on Dark Athena. In order to get this you must defeat Gale Revas using only Fists, Hairpin, Club, Combat Knife and your Ulavs. The Ulavs might seem the obvious solution but it turns out that your fists are the weapon of choice for this fight. The key to winning is to run up to her, run back for a fraction of a second and then punch doing a very fast upper cut. Don't try to block her attacks just run away and heal. Don't try to get another hit in after she stumbles, you'll just hurt yourself.

This strategy works on hard difficulty. It may take a few goes but its easy enough.

I tried doing what Confused Shelf wrote in his solution but you need to time it very well and Revas doesnt always act the way you need her to when you run up to her. So i decided to try something else to give players another option and this is what i came up with:

Circle around the big console in the middle of the room, keeping Revas close to being on the opposite side. When Revas is about to go past the chair with Dacher's body, crouch () and keep going. If you time it right Revas will lose track of you and stop. This is your chance to sneak up behind her and hit her until she turns around (you should be able to get about 3 hits). Repeat.

I strive to make my solutions the best they can be so please leave a comment if you have any feedback, good or bad, and i will try to improve it.