Complete the following achievements to unlock Xbox Live Gamerscore points.
Achievement | How to unlock
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- Clear zone 1 on Easy (60 points)
| - Clear all levels in zone 1 on Easy.
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- Clear zone 1 on Normal (160 points)
| - Clear all levels in zone 1 on Normal.
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- Clear zone 2 on Easy (80 points)
| - Clear all levels in zone 2 on Easy.
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- Clear zone 2 on Normal (180 points)
| - Clear all levels in zone 2 on Normal.
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- Clear zone 3 on Easy (100 points)
| - Clear all levels in zone 3 on Easy.
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- Clear zone 3 on Normal (200 points)
| - Clear all levels in zone 3 on Normal.
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| - Kill ten or more zombies with a shot.
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| - Kill two or more zombies with a shot.
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| - Kill fifteen or more zombies with a shot.
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| - Kill five or more zombies with a shot.
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| - Kill twenty or more zombies with a shot.
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- Zombie killer (10 points)
| - Kill one or more zombies.
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