Has anyone else noticed this happening? So far, in the burnt biome the only 2 that seem to register so far are spider or crawler zombies, i've killed most of the other normals but they do not seem to be counting. Any fix for this?
I haven't had this problem. Any zombie I killed inside the burnt biome counted towards the total number of random zombies I needed to kill. On the PC you can press y and then select track on that achievement in it will update automatically as you whack them. Try that and see if it updates.