The Chronicles of Riddick: Assault on Dark Athena

Tip for HARD mode.

Easiest place to do this from is; edge towards the door where the Alpha Drone busts through, then quickly run to the archway/tunnel you can see. Go to the end that's not on the 'higher' end of the tunnel and the drone will shoot a rocket at you, killing the light above your head. This gives you the cover of darkness :)

Now just stay in that corner of the tunnel and pop a shot off making sure you hit the drone, and run back around the corner so the rocket he fires doesn't hit you.

As you repeat this, just as you fire your 5th shot, run straight out after it and detonate them as soon as it hits the drone, on hard mode it seems you really don't get long at all to get up close and hit the Y button. May take a few tries to see the pattern the drone adopts, since sometimes he wanders off around the top end of the map, don't be tempted to follow it, the tunnel is by far the easiest/safest/quickest way to this section.

killing the alpha requires the scar gun. you have to plant all 5 shots and detonate them then walk up to it and follow the on screen prompt for a close kill with the ulaks.