Unfrigginbelievable medal

Unfrigginbelievable
From Halopedia, the Halo 3 Encyclopedia

Unfrigginbelievable is a new medal in Halo: Reach that is awarded for killing 40 opponents in a row without dying, or 1000 enemies in a row on Campaign or Firefight without dying. It takes on the look of the old Halo 3 Invincible medal. It has been first sighted at Bungie.net's Halo Reach Service Record.