clusterluck achievment help!

in gow im havin trouble getting this achievment, i cant really figure out a good way to kill so many guys at once aside from a lucky nad throw.  The only thing i can think of, which i havent tried yet, is to throw a nad into an emergence hole as a few enemies start to pop out.

Act 3, Chapter: EvolutionRebornInFlames

thats it thank you.

This one works like a charm 

http://www.youtube.com/watch?v=nj0ib_HkRyg

in gow im havin trouble getting this achievment, i cant really figure out a good way to kill so many guys at once aside from a lucky nad throw. The only thing i can think of, which i havent tried yet, is to throw a nad into an emergence hole as a few enemies start to pop out.

Hott-FuzZ

Act 1, when you see the locust come threw the doors in the prison throw a grenade.littleman1992

 Ya this one is quick and easy.