Two friends and I recently completed a Prison of Elders level with all 3 of us in our clan, and wearing the clan tag. We all started the run together, finished it together with no one leaving or joining. One member of the fireteam received the "Raiding Party" Achievement but I, along with our 3rd member did not. How can that be possible if the criteria requires a group effort?
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Can you get flawless raider this way?