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I see a few very stupid suggestions to get the achievement, I got an even easier one. Turn off Devils. Get fake walls.Create corridor where only one zombie at a time can fit. Equip pistol. Weigh down the space bar. Leave. :p I literally did it in my sleep. :p
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Learn the meaning of life what hell we will do with the meaning of life after u kill every one u will kill your self after this
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I prefer story's to mindless death. But it is always fun to massively destroy 100000's of peons. keep up the good work.
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To help people, select big boxy map, then spam the rocket launcher, remembering to recharge. Also, turn "devils", "friendly fire"With this, I got full multiplier (x999) and got the badge easy. Useful if you are doing the "Best of '07" quest. BTW, all the other things people have written work as well.