Sumerian Six achievements

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Face Your Inner Demons
Siegfried von Adelsberg received a (somewhat lukewarm) welcome back to Enigma Squad
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Daddy Issues
Alistair Sterling decided to join the action in person
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General
Beat all missions on Medium difficulty or higher
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Lieutenant
Beat all missions on any difficulty level
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Site of Sacrifice
Beat the Site of Sacrifice level
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Kammler's Underground Complex
Beat Kammler's Underground Complex level
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Kammler's Secret Base
Beat Kammler's Secret Base level
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Gis-Eren
Beat the Gis-Eren level
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Prototype Testing Site
Beat the Prototype Testing Site level
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Al-Bhutan Oil Depot
Beat the Al-Bhutan Oil Depot level
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Madinat Aldaala
Beat the Madinat Aldaala level
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Field Marshal
Beat all missions on Hard difficulty