From Halopedia, the Halo wiki
Shotgun Spree is a spree medal awarded in Halo 3, Halo 3: ODST and Halo: Reach Multiplayer, Campaign and Firefight. In Halo: 3 and Halo 3: ODST it is awarded for killing five opponents in a row with the Shotgun without dying. The M90 CAWS (not the Mauler) has to be the weapon that kills the opponent. In Halo: Reach the medal does not require kills to be consecutive, just that the player kill five enemies with the shotgun without dying.
Melees with the shotgun do not count toward the medal.
It is represented by a steel four-pointed star with three blue Shotgun shells in the middle.
- In Halo 3 this medal is known to not register up and not be given to the player sometimes when associated with multikills, or when you die right when you get the last kill.
- It is easy to get this medal during an Infection match while playing as a human. Prior to the shutdown of Xbox 360 Halo online services on January 13, 2022, and doing so on Citadel in Halo 3 would unlock the Pull! achievement.