Forest Scenario:
Beat the Night Watch level on the "00 Agent" difficulty with a time of or less than 2:20.

Exotic Skins:
Beat the Cold Reception on the "00 Agent" difficulty with a time of or less than 3:25.

Navy Skins:
Beat the A Sinking Feeling on the "00 Agent" difficulty with a time of or less than 2:55.

Exotic Weapons:
Beat the Thames Chase level on the "00 Agent" Difficulty with a time of or less than 4:25.

Thanks to Revolution reader Mr. X!