Bro Hammer

 is an achievement in Halo: Combat Evolved Anniversary and Halo: The Master Chief Collection.

Halo: Combat Evolved Anniversary
In Halo: Combat Evolved Anniversary, the achievement is awarded for completing any level cooperatively on Legendary difficulty. It is worth 50 gamerpoints. The achievement is represented by two Sangheili skulls over the Heroic difficulty shield.

Halo: The Master Chief Collection
In Halo: The Master Chief Collection, the achievement is awarded for completing any level cooperatively on Legendary difficulty in any game. The achievement is worth 10 gamerpoints.

The Xbox achievement icon is the loading image of Nebula from Halo 2: Anniversary.

Trivia

 * 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, respectively.
 * The achievement is a reference to Carol Rawley's callsign, "Foehammer".