Retro Game Tips for Halo 3: ODST (Xbox 360)
Achievement: All Ears (30)
Achievement: Be Like Marty (10)
When:
during game
How:
In Firefight, finish a full round without killing a single enemy.
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Achievement: Both Tubes (5)
Achievement: Campaign Complete: Legendary (100)
When:
during game
How:
Complete the Campaign on Legendary to unlock a new Firefight character.
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Achievement: Campaign Complete: Normal (100)
Achievement: Coastal Highway (50)
When:
during game
How:
Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefight mission.
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Achievement: Dark Times (5)
Achievement: Data Hive (50)
When:
during game
How:
Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefight mission.
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Achievement: Dome Inspector (5)
Achievement: Ewww, Sticky (5)
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