Dead Alliance

This may well be the last gun you get access to, as you have to buy this one, its not a standard load out, and it costs a whopping £100k.

That said, what I did was just work on the other guns, accruing cash per round, and when I has enough purchased it.

You then need to create a custom heavy load out with it - I would recommend playing Single Player, Seascape, Free for All. Once I was familiar with the map, I was able to get between 50-70 kills per 10 minute game.

Assuming 50 kills per game, it will take 20 games, 10 minutes each, 200 minutes, so just under 3 1/2 hours solid boosting to unlock. Good luck!!