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how the crap do you kill 53,000 somethin zombies in the amount of time u have? I hit the maitenence tunnels but i cant do it!

Start a 72 hour mode game. As you as you get control over Frank and kill zombies in that first scene, run to the tunnels. Take the motorcycle in the tunnels and take a left as soon as you can, follow it, then take the truck that you used in the Bomb Collector case file.
Now, I have found a route that works quite well for getting the genocide achievement. Take the truck, go straight and don't take any turns unless you have to. You should come to a rotary of sorts in the tunnels (I'm sure you know that I'm talking about). Just go around this rotary and go back the way you came, towards the meat processing center. By you time you get back there, your truck should have broken down realtively close. If not, just run over zombies in that small area. When your truck breaks down, go into the meat processing center doors, then right back out again. Now there is another truck for you to use. Repeat as necessary. Just ignore the story and drive while killing zombies. I have got the "Stunt Driver" achievement while doing this! Dunno how, but it looked like I hit a propane tank and a shopping cart at the right angle, and the truck bounced off the ceiling!

Yeah its exactly how he said it but you can also get other achivments for doing zombie Genocider. Indoorsman and Zombie Road. indoorsman: stay 24 hours indoors, Zombie road: use a Zombie ride in the maintenaince tunnel and use it where there is a bunch of zombies and walk there for a long time and you should get the achievment.