Perfect Dark Zero

For this achievement all you need to do is COMPLETE 100 Deathmatch games, starting but not finishing does not count. For my settings i used:

Scenario: Team Deathmatch

Map: Old Town

Bots: 7 (Put 4 on your team and make them Dark Agent, have 3 on the other team be Special Agent*)
*Reason: I found that putting the enemy bots on just agent wasn't as fast, Agent bots tend to bumble around and run away from the enemy team sometimes.

Score Limit: 5

Time Limit: 10

Weapons: All Jackals -- I used Jackals because they are one hit kills with a headshot, and most of the time Dark Bots will pull off a headshot.

Just start the game and sit back. If you feel like helping your bots out feel free but most of the time i got off about 2 shots before the match ended. Once its over just start up a new one. My average match lasted about 20 seconds, including load time you can expect to crank out 2 matches a minute, which translates into about 50 minutes to an hour to get this achievement depending on load times and the like. I also had the game installed to my hard drive to cut down on load time.
If you have any questions pm me on xbox or on here. Please do so before voting negatively as well so i can change the guide in any way. Good luck on this one and your inevitable try for the 1000 matches played.

start a local deathmatch game with hardest bots set lowest time and kills finish, then repeat 99 more times

Here a way to do it quickly
map: any

bots:7( four yourside and three on the other.(have your bots on dark agents. Other side a agents))

scoer limit:5

Time limit:10

this will work for the 1000 match one too.