Do you have every Multiplayer DLC installed, especially the last one, Retaliation and the latest Patch (1.07 on PS3 afaik)?
All patches....yes. DLCs....no. I'm guessing I need them then? That sucks!
You need every MP DLC, especially Retaliation as the challenge system was introduced alongside with it. Why does this suck? The MP DLCs are all free, you just have to download and install them, that's all.
Free? They are like $14 bucks each for the latest ones and $10 for the earlier ones. I'm not a PSPlus member though...that may make a difference. Maybe I'm confusing this with expansion packs or something but I haven't seen anything in the PSStore for ME3 that's free that I don't already have.
The Multiplayer DLCs (Resurgence, Rebellion, Earth, Retaliation) are all free. What you're talking about are the Single Player DLCs like Omega, Leviathan, From Ashes, which are paid DLCs but are not needed for any Multiplayer-feature at all. Look up Retaliation in the PS store if you don't already have it or if you do try to do a repair or re-install. This should enable the challenge system.
