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At the end of Episode 4, you will come to a stage at the Anderson Farm. This will be a fairly lengthy battle sequence where Alan has to battle the Taken, but luckily there is a ton of ammo laying around. As long as you don't drop down to the last bar of health, you will obtain this achievement. Just play it smart, the Taken cannot spawn behind you so pay attention to both the left and right sides of the stage. When Barry flicks on the stage light, run into it to heal up. This should be very easy on the Easy difficulty, although I obtained it on Hard. If you mess up, simply reload the checkpoint.