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Darkness Falls

Complete the first mission on normal difficulty or higher.

Darkness Falls0
1 guideOffline Game ModeSingle PlayerMain StorylineDifficulty Specific
02 Feb 2009
7 0 0
Play the game in single player on Normal or Hardcore difficulty. This Achievement will unlock upon completion of the first mission, "Darkness Falls".

Note that the mission is in two parts, so when it first appears that the mission is complete, you're actually just loading into the second half.