User blog comment:Dolten/Call of Duty: Black Ops Achievements/Trophies (SPOILER ALERT)/@comment-1957587-20101001013050/@comment-66.169.101.69-20101001044033

Probably like "Friends with benefits" challenge from MW2. An adrenaline type achievement would probably be more than 6 zombies, 6 seems about right for a pack-a-punched explosive bolt.