Unreal Tournament 3

This achievement invloves using the Stinger minigun to get 15 kills in 10 different matches. The best way to do this is set up a multiplayer match(I don't think it works if you do it in Instant Action), Deathmatch to 20 kills(to work on the "Paint the Town Red" and "Get a life..." achievements simultaniously) private match on Morbias Arena(smallest map), max bots, and set the mutators to weapon replacement Stinger minigun for all guns. Should take less than half an hour to do this achievement.

Set up a game like shown in the following video, but instead of spawning pistols, spawn the stinger (minigun) and go through killing everyone. Repeat 10 times to get "Blue Streak" award instead of "Gunslinger".

Blue Streak is awarded for 15 kills in 1 match with the stinger.

This should take you 10 minutes using this method.