Walk into the large room, walk all the way left, then up. You'll seed debris forming a wall with a little spot just for you. The aliens have limited angle to attack, and this is to your advantage.
Between waves, run out for ammo and medkits. You can safely stand there and shoot, despite the radiation vent. Use the assault rifle for the first 2 or 3 waves, then use a lot of your hyper blaster(mini-gun) ammo.
I made it to Wave 11, at 13:50. (score 144,415, current #10 All-Time)
This achievement unlocks after you pass the 8min mark, then die. Good luck. Not too hard, once you know what to do.
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