A Fine ChoiceG 10

Complete any one of the eight possible playlists in under Halo CE. The two shortest playlists are VEHICLE PLAYGROUND and DARING ESCAPES, each with 3 levels from Halo CE. They are both set to normal with no skulls on. Personally I would choose one of the campaign lists since you are going to have to play the entire game anyways for the rest of the achievements. Don't waste those levels!