Awarded for completing 1500 multiplayer games.

You're going to need to spend a lot of time completing multiplayer matches for this. All match types count towards this achievement so you can work towards the other game modes as well earning completed games for this achievement. This will be easier to boost until you feel like playing hours of multiplayer with little to no community.

You only need to complete the matches, either winning or loosing, it doesn't matter as it will count either way. You can start all matches with two players, you can also use private matches toward this achievement.