Found the Loot Fairy as a co-op team, and it didn't give me co-op credit for the module. (I did get the extra loot.)
The flag that tells the client which modules have been completed as co-op so you can get the BFF achievement. In this case, I should have gotten GNO2COOP but didn't.
Yeah, Stexe and I did it with Mr. Magnifico. We didn't get the Ally achievement. I'm guessing it's because we left the team before Mr. Magnifico clicked "Finish", although I at least had clicked "Finish" on my client.
Actually, when I noticed it neither of us were using Steam. Disbanding the team before returning to the worldmap may have been the case, though. I'll try to test it at today's LF just as soon as I can log in.
Did Loot Fairy with Stexe, both of us returned to map before disbanding, still didn't get co-op credit. EDIT: Did a non-LF module as co-op, still no co-op flag.
I see the problem. These flags are only being awarded for completions made for never before completed adventures. I will fix.