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It must be unlocked while playing Infection on a map from the Defiant map pack. The only map this is obtainable on is "Condemned" which rarely comes up as a choice for voting. Seems that 343 made these achievements a little TOO specific. Whether it was intentional
or not is unknown. Hopefully they fix it, but until then, keep trying for it. If Condemned ever comes up, tell everyone to vote for itl lol.
The trick is you need to play living dead with 12 players who have the defiant map pack, if 1 player in the party doesn't have the defiant map pack it won't show up in the map rotation. also can't get it on anniversary ffa