The following achievement is related to the Extermination medal. In August 9, 2023, the medal will be available in all multiplayer modes via an update during Season 04: Infection. The medal was only available within the Extermination gamemode, where the player performs an Extermination within one round.

The exact specifics are unknown, but the medal seems to require one to get 4 kills on the same team in about the maximum time you can get an overkill in (12 seconds) instead of the Overkill medal itself. DEVIL JACKET HALO FRIENDLIES ANGELCORPSE STUCK MOJO STATIC-X METAL CHURCH. An easy way to get this medal is in Grifball, which is played in close quarters with Gravity Hammers and Energy Swords. SPITE CANNIBAL CORPSE OVERKILL ANGELCORPSE MEGADETH CANNIBAL CORPSE REACH. In Halo: Reach, it is possible to earn an Extermination without getting an Overkill. Earning this medal in a ranked free-for-all Halo 3 matchmaking match will unlock the Overkill achievement, as well as the Commando harness helmet and Ascetic harness shoulders. It can also be obtained by killing the person who is in a team consisting only of himself, four times within four seconds of each kill. Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).

The medal is likely more common in game modes such as SWAT as time-to-kill can be instantaneous. This medal can be considered very difficult to earn, requiring a player to not only encounter four enemies together but also successfully and quickly kill the team.

Halo 3 overkill