To unlock this achievement you need to play a multiplayer match but you will only matchmake with people with the same DLC as you including the resistance warrior pack, so try uninstalling all the DLC and search for a ranked/casual match, if it doesnt work you can message me GT Muffin0327 to play a private match, remember that you need to uninstall all the DLC to make it work.
Edit : While i enjoyed helping some of you, I no longer have the game installed and haven't bought gold in a long time, life got a lot busier. Since the game is so old by now player numbers are incredibly low, so the only reliable way to get this achievement is by boosting it.