Mile High Club Achievement - CoD4

This achievement is a pain in the ass, but it is doable.

The key is to learn the flashbang spots, and also to reload your gun whenever you have time to.

The key reload is when you are lying on the ground behind cover in the hull breach room. Reload one gun while on the ground, then reload the other gun while walking to the stairs.

Don't forget to pick up the extra flashbangs upstairs.

You must headshot the last guy in order to kill him.

60 seconds isn't much time, so you need to keep moving. That's why you need to flashbangs around every corner. Once you move up, your guys will help kill a few.