The very first time you are introduced to a mutant zombie is when you make it to the broken bridge, you can not miss it, since its part of your main quest. You will get a short cutscene showing you a zombie step into some green goo on the ground and transforming into a mutant.
Recommend to get this achievement here, since it will be the only zombie you would have to worry about.
Start to run around the mutant zombie and bring its health down with the shotgun until a small amount of health remains (red bar), switch to your fists, pressing and finish killing the mutant zombie. Just remember to deliver the finally hit with your fists.
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