Halo Alpha
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Halo Alpha
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Cleansing is a Campaign Achievement for Halo 3 and Halo: The Master Chief Collection.

It is obtained when someone finishes the Campaign mission Floodgate on the Normal, Heroic, or Legendary difficulty. In Halo: The Master Chief Collection, it is possible to get this achievement on Easy.

The Halo 3 achievement gives 30 Gamerpoints to the player and is represented by a blue plate, with a roman numeral V (five) on it.

The level must be played from Mission Start in order to unlock the achievement. Playing in co-op will still earn the achievement.

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