There are three multiplayer achievements. You can get them all in 15-30 minutes depending on how long it takes you to get a win.
To get this, you need to join a Network. Networks are groups of players of a like mind that like to play with each other. Any Network will do. If you're interested, there is a TrueAchievements Network. It is called TrueAchievements and has a tag of TA. We welcome everyone!
So It Begins...
This requires you to win a multiplayer match. No secrets here. Play until you win one. You do not need to play the entire match so long as you win. If you've managed to get a Coliseum Ticket without playing (there are promotions for them occasionally), you can get your win in the Coliseum which would be by far the fastest way to do it.
Lock and Load
This requires you to customize your loadout. From the main multiplayer menu, go to Customize and then change anything about one of the loadouts. You'll net your achievement for making the change.
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