Akimbo Assassin - 30G
Survive an entire campaign using only pistols

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This is not as hard as it seems. This can be done with 3 other people who can shoot any weapon they want, just as long as you only fire pistols. You cannot use the minigun.

Start the No Mercy campaign on easy, and when you start, just dont pick up a weapon. Punching, pipe-bombs, and molotovs dont cancel out the achievement, so go ahead. This must be done in one sitting. You can't quit out and then continue from where you left off.