| Achievement | How to unlock
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| - Complete campaign (all missions) on Normal difficulty.
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| - Complete 'Basic Training' to gain this achievement.
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| - Complete 'The Battle of Pudding Lane' with a score of 1100 or more.
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| - Complete mission 'The Battle of Pudding Lane' to gain this achievement.
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| - Complete mission 'Burying the Dead' to gain this achievement.
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| - Complete mission 'Chess with the Dead' to gain this achievement.
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| - Complete campaign and keep the main investigators alive.
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| - Complete 'Burying the Dead' with a score of 1100 or more.
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| - Complete 'Not Dead But Dreaming' with a score of 1100 or more.
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| - Complete 'Chess with the Dead' with a score of 1100 or more.
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| - Complete Mission 'Death by Gas' to gain this achievement.
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| - Complete 'Death by Gas' with a score of 1100 or more.
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| - Complete 'The Many Voices' with a score of 1100 or more.
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| - Complete campaign without any units going insane.
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| - Complete campaign; main units alive, score 10000+.
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| - Complete Mission 'Not Dead But Dreaming' to gain this achievement.
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| - Complete 'The Raid' with a score of 1100 or more.
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| - Complete 'The Fire Speaks' with a score of 1100 or more.
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| - Complete mission 'The Fire Speaks' to gain this achievement.
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| - Complete campaign (all missions) on Hard difficulty.
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| - Complete mission 'The Many Voices' to gain this achievement.
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| - Complete mission 'The Raid' to gain this achievement.
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| - Complete 'The Thunder Speaks' with a score of 1100 or more.
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| - Complete mission 'The Thunder Speaks' to gain this achievement.
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