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