0 day Attack on Earth

These are the long snake enemies in the Paris levels. Like the mosquito and sandwich enemies, they show up as yellow dots on the radar. This achievement is kind of a pain because your wingmen will often steal your kill since it's such a big target. A way to ensure you get the kill is to shoot it until its health gets down to about 1/4 and then bomb it.

The kill count is cumulative across games, both co-op and single player.