Basically all you need to do is get 4000 kills for this achievement. I used the military helicopter because it was easier than the tank and just walking around shooting people was too slow. Now this does take along time so expect to play for a while.
To get the military helicopter you need to purchase the abandoned airstrip in the last city.Then you want to complete all the airplane missions and achieve 100 percent in the process on everyone of the missions. The helicopter will then appear next to the plane.
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The Los Santos Slayer is an achievement/trophy in Grand Theft Auto: San Andreas. Simply complete...