just be sure to get the two tanks to fire their 2 sets of 5 rows on your left or right and make sure sure you're middle left or middle right depending on where the tanks are firing.. Once you get the repel down, you can slow them down when they turn green (they slow down anyhow when green) to line them up for the achievement.
Splacko wrote:
I tried this SO MANY times last night, and was still unable to get it. I even looked at the vid and tried to use it as a template, to no avail. I'll just have to try a bit harder.
Zombies everywhere, zombies everywhere, zombies everywhere. They're coming for your brains and it's too late to change.