To get this achievement you need to complete 12 levels on the vigilante mode. I suggest you use the military helicopter because it is easier then other police cars and its pretty fast. However you can use the other police cars but they will blow up fast. The police bike is the second suggested because you can shoot at your target from the front. You will also need around 5000 sub-machine gun bullets as you are shooting a lot during this mission. Also i put the police bike in my garage and saved. That way all you have to do is reload your game when you die. Keep in mind that if you are using anything other then the tank or the military helicopter you will die a lot and it will take you a lot of tries.
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What the City Needs is an achievement/trophy in Grand Theft Auto: San Andreas. To get this...