Halo 3 Achievements
| Achievement Name | Gamerpoints Rewarded | How to get it
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| Landfall | 20 | *Finish the first level of the campaign on any difficulty level.
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| Holdout | 20 | *Finish the second level of the campaign on any difficulty level.
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| The Road | 20 | *Finish the third level of the campaign on any difficulty level.
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| Assault | 30 | *Finish the fourth level of the campaign on any difficulty level.
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| Cleansing | 30 | *Finish the fifth level of the campaign on any difficulty level.
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| Refuge | 30 | *Finish the sixth level of the campaign on any difficulty level.
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| Last Stand | 40 | *Finish the seventh level of the campaign on any difficulty level.
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| The Key | 40 | *Finish the eighth level of the campaign on any difficulty level.
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| Return | 50 | *Finish the final level of the campaign on any difficulty level.
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| Campaign Complete: Normal | 125 | Complete the campaign on Normal.
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| Campaign Complete: Heroic | 125 | **Complete the campaign on Heroic.
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| Campaign Complete: Legendary | 125 | **Complete the campaign on Legendary.
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| Iron | 10 | Find & claim the "Iron" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Black Eye | 10 | Find & claim the "Black Eye" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Tough Luck | 10 | Find & claim the "Tough Luck" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Catch | 10 | Find & claim the "Catch" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Fog | 10 | Find & claim the "Fog" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Famine | 10 | Find & claim the "Famine" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Thunderstorm | 10 | Find & claim the "Thunderstorm" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Tilt | 10 | Find & claim the "Tilt" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Mythic | 10 | Find & claim the "Mythic" skull while playing in Normal, Heroic, or Legendary difficulties.
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| Graduate | 10 | ***Complete the basic training requirements by either completing 10 games, or earning five experience.
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| UNSC Spartan | 15 | ***Earn a "Sergeant" rating to be recongnized as a true spartan.
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| Spartan Officer | 25 | ***Advance to the Spartan Officer rank.
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| Two for One | 5 | ***Get a Double Kill with a single Spartan Laser shot during a ranked free-for-all playlist.
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| Too Close to the Sun | 5 | Shoot down an enemy banshee with either a spartan laser or a missile pod during a ranked free-for-all playlist or during the campaign.
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| Triple Kill | 5 | ***Kill three enemies within a four second period during a ranked free-for-all playlist.
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| Overkill | 5 | ***Kill four enemies withing a four-second period during a ranked free-for-all playlist.
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| Lee R. Wilson Memorial | 5 | ***Get five grenade sticks in any ranked free-for-all playlist.
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| We're in for Some Chop | 5 | Destroy an enemy vehicle using equipment in any ranked playlist or during the campaign. (Tip at bottom of page)
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| Killing Frenzy | 5 | ***Kill ten enemies without dying once in any ranked free-for-all playlist.
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