Survive 1000 rounds of DarkOps: Eradication. The quickest way to get this achievement, is to set up a match with the following settings:
Map: Old Town
Weapons: Disallow all but Jackals
Starting Amount: 15,000CR
Bots: 15 (14 Dark Agents on your side, 1 on the other)
Points Limit: None
Stay in your spawn. Your teammates will take care of the opponent. Every round that you remain alive, is a round survived. Using this method, it will take 8 hours to survive 1000 rounds. It can be a mix of online and offline.
*You must complete the match for your achievement progress to register.