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To unlock this achivement the player needs to collect the Fog Skull. It is worth 10 G.
This skull is a pretty useful one for getting the Campaign Scoring achievments because it only takes away your motion tracker which I find isnt very reliable anyway.
Related Threadshaving trouble getting the fog skull >_< - last post by @ Oct 6, 2012
Fog--*(spoilers)*-- - last post by @ Oct 7, 2007