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I just finished a Grand Cathay campaign and unlocked the Eastern Emperor achievement for Grand Cathay on Steam, but I noticed that there is another, duplicate Eastern Emperor achievement on Steam, and they both have the same exact description, "Playing as Cathay, win a singleplayer campaign." I unlocked one of the duplicates, but the other one remains unlocked. I'm not sure if this is a Total War/Creative Assembly issue or a Steam issue, but there only needs to be one Eastern Emperor achievement.