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How do you get primitive man achievement on Zombie Sweeper

How do you get primitive man achievement on Zombie Sweeper
You have to kill 500 zombies with the bone (the default weapon they give you) what I did was I went on a hardcore level (I can't stand normal it's too slow) and I just switched off with weapons to make sure I didn't die, since it's hard to survive with using just the bone, and I just kept playing until the notif came up that I got the achievement