As stated, be the last alive in Blackout mode. As of now, I have had the best luck with this in Solo. Gun fights seem to go quicker, when you down someone, they stay down. You also don't have to worry as much about a guy's buddy flanking around you when you get into a gun fight. I would definitely practice getting into gunfights before going for this. Drop into the hottest parts of the map you can find, don't worry about winning, and just practice your gun game. When you're confident with that, and the idea of a gunfight doesn't worry you as much, it's a matter of a little luck coupled with skill. If you can get a hold of a good setup gear wise, play conservatively, and worry about getting to the end. Only engage when necessary, and if you get to the last circle, and don't see the other guy, don't panic. Don't pop off unnecessary shots or fish with your grenades. If you've got a stun grenade now's the time that it shines. Use any kind of advantage you have, but don't panic. Hopefully your gunfight practice will see you through. Good luck!