The Chronicles of Riddick: Assault on Dark Athena

WARNING!! This method will likely reset all of your progress from both campaigns. Get them first, or create a backup save somewhere else and don't touch it until after you've done this.

You can do this in a MUCH easier way. I beat the game 2 years ago on Easy, and just popped this one now. You don't even have to play through all of the Executive level, just the last checkpoint, which the game conveniently saves for you.

The bad news is that you have to fight the last boss on Hard, but that's surprisingly easy. Follow Confused Shelf's outline.

1) Beat the game on Easy. Or Normal. Your choice. You could also beat it on Hard if you want to, that would also work.

2) This is important: make sure you stop and move your file before you beat the last boss, else you'll have to play through the last level again. (Not too hard, though, only about 5 minutes or so.)

3) Assuming you didn't beat this on Hard (and that's why you're reading this), go to the dashboard and move your savegame to a memory stick.

4) Go back into the game and start a new game on Hard. Play through to the first checkpoint. (I went all the way to after I jumped down to kill the drone, but you might be able to do this before that.)

5) Exit the game. Go to Options => Select Storage Device. Select your memory stick.

6) Select Continue Game. You will find yourself just before the last fight. You'll find that she's quite a bit trickier than he was before... the game has scaled the difficulty up to Hard.

7) As Confused Shelf said, use the SCAR gun on the elevator button to open the shaft. Then shoot her about twice each time to knock her down and closer to the shaft. You may not even need to melee her; I was able to just keep blasting her back with the SCAR.

8) The cheeve will pop as the credits roll.

This guide is for the last boss battle. What might appear at first to be a challenging fight is actually very straightforward. When you first walk into the room, before the cutscene fire at the switch at the opposite end with your SCAR gun and blow the lift door open. Walk forward and trigger the cutscene with Revas and then rush her position. If you were in the right place Revas won't see you. Equip your Ulaks, charge round on the left of the computer block and slash away. If you pull the trigger fast enough she won't be able to fight back and once she takes damage she will start to fall over, hopefully towards the list shaft. Keep pushing her all the way over until she falls triggering another cutscene and the credits and with any luck, your achievement.

Alternatively, although I haven't tried this. Save up all your SMG ammo and then position her between you and the lift shaft and open fire. She goes shooting across the floor, unable to fire and this might work for knocking her down the shaft.

Edit: I have since completed the game again and the SMG stratergy works a charm. You can end the fight in a matter of seconds. There is only one opportunity to get the SMG after leaving the Athena for the first time so make sure you don't miss it. It's on a Merc just after defeating your first Alpha Drone but before defeating your second.