Bro Hammer
From Halopedia, the Halo wiki
Brohammer
Brohammer is an achievement in Halo: Combat Evolved Anniversary. It is awarded for completing any level cooperatively on Legendary difficulty.[1] It is worth 50 gamerpoints. Receiving this achievement also unlocks the Standard Operating Brocedure and Brovershield achievements if the player hasn't completed a level cooperatively on Normal or Heroic.
Trivia
The achievement is a reference to Carol "Foehammer" Rawley.
Sources
