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H3 Achievement Exterminator.png Exterminator.jpg
10 Gamerscore.gif

Exterminator is an achievement in Halo 3 and Halo: The Master Chief Collection. It is unlocked by beating the par score on the level Floodgate. The achievement is worth 10 Gamerpoints. It is represented by a blue circle with a horned medieval helmet, also known as the "Warrior" emblem, in the original game and a screenshot of Ghost Town in the collection.

The par score for Floodgate is 15,000 points in Halo 3 and 25,000 points in The Master Chief Collection; the difference is due to the fact that the two games feature different campaign scoring formulae. Though the achievement can theoretically be unlocked on any difficulty, more points are awarded in campaign scoring when playing on higher difficulties.

In the original game, players must achieve the par score individually, even when playing cooperatively; in The Master Chief Collection cooperative players share a single score, potentially making the achievement much easier.


The Catch Skull has no effect on the Flood as they don't throw grenades. Because this skull will not make the Flood any more dangerous, it is an excellent way to add a multiplier without making the level more difficult. That being said, Marines and Elites are affected by the Catch skull, thus the player must be wary of being fragged by friendly fire.


  • The level is aptly named, because it is the first level to feature the Flood in Halo 3, and it lets the player "exterminate" them.
  • In the original game, this is most likely one of the most difficult levels to score 15,000 points in, as it is the shortest level and the Arbiter and Elites can steal valuable points.
Achievements in Halo 3
Campaign LandfallHoldoutThe RoadAssaultCleansingRefugeLast StandThe KeyReturnCampaign Complete: NormalCampaign Complete: HeroicCampaign Complete: LegendaryMarathon Man
Meta-game GuerillaDemonCavalierAskarExterminatorRangerVanguardOrpheusReclaimer
Campaign Skulls IronBlack EyeTough LuckCatchFogFamineThunderstormTiltMythic
Mythic Map Skulls Assembly SkullCitadel SkullHeretic SkullLongshore SkullOrbital SkullSandbox Skull
Multiplayer GraduateUNSC SpartanSpartan OfficerTwo for OneToo Close to the SunTriple KillOverkillLee R. Wilson MemorialWe're in for Some ChopKilling FrenzySteppin' RazorMongoose MowdownUp Close and PersonalFear the Pink MistHeadshot HonchoUsed Car SalesmanMVPMaybe Next Time Buddy
Legendary Maps Multiplayer Look Both WaysRoad RageFlag DroppedDefend ThisCame... From... BehindAlas, Poor YorickDouble Double
Mythic Maps Multiplayer Hammer TimeBlades of FuryGhost PatrolPost Mortem... Get the HornsAwww, Too BadKilltacularHave Fun RespawningSave This FilmDelicious BrainsZombie RepellerTank DropperPull!
Vidmaster Challenges Vidmaster Challenge: LightswitchVidmaster Challenge: AnnualVidmaster Challenge: 7 on 7Vidmaster Challenge: Brainpan