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I just bought the game recently and was trying to unlock Boris in my first campaign. I completed the requirements to start "The Frozen Falls" quest, finished the quest, and gave Boris Erengard. I realized I didn't get the achievement "The Battle for Bokha" and checked the main menu to see if Boris was in the Kislev roster and was surprised to not find him. I checked the forums to find a solution but haven't found one.