Iron Man - Golden Gate - 25G
Complete chapter 7 in the Single Player Campaign without dying or restarting a checkpoint

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These can be done on any difficulty so I recommend trying for them on easy. Take your time. Watch out for frag grenades and RPG's as these are instant kills. Take cover to allow your health to fully recover, which only takes 3-4 seconds. Your AI teammates, once again, come in handy for this as well. Quitting to dashboard or starting from the final checkpoint in the level voids these achievements - they must be done start to finish.