there not very good but whatever?! Over the top - G25: destroy and kill every covenant on the bridge before blowing it up. Whats the point? - G25: destroy all the vehicles before starting one of the charges. Aah, the memories! - G100: complete the campaign on normal. The credit crunch - G10: complete the first level without firing any bullet. (melee alowed). Eat lead worm man! - G25: kill a hunter with a pistol only, no melee. Party up! - G50: reach level 50 in firefight with atleast 4 players over xbox live. Ghost busters - G25 destroy 5 ghosts in campaign. (if there arent ghosts in campaign then my bad) Master cheif, your fired. - G125: complete campaign on legendary.