Infinity Multiplayer :: War Games related. Online Required.
Win 20 matchmade games within War Games mode. Does NOT need to be in a row, nor in one sitting.
“War Games” is the new name for Halo Matchmaking. Although it is possible to boost, it is not recommended as it would be quite a challenge to match with your friends. Team games work best here as you have a better chance at winning over Free-for-all. Just take your time to play online and try to play smart. After winning a total of 20 games, you will gain this achievement.
If you are eager to gain this achievement, “SWAT” games are usually the fastest at around 3-5 minutes.