Having trouble getting the "Kill atleast 5 zombies on Ascension with 1 Gersch device" achievement. I threw it out like 5 times and each time I'd kill over 15 zombies. Did this right by the lunar lander. Any advice???
All I can think is that maybe you've mistaken a different weapon for the Gersh device. Are you using the grenade-like black hole generator? If that's not the issue, then I don't know what to tell you. Sorry.