The Storm - Campaign level - Halo 3 - Halopedia, the Halo wiki

The Storm is the fifth campaign level of Halo 3. Upon completing it on Normal, Heroic, or Legendary the player will unlock Assault achievement, worth 20 Gamerscore. If a player gets more than 15,000 points in the meta-game he or she will unlock the Askar achievement, worth 10 Gamerscore.

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