Various Game Center Achievements
Complete the following tasks to unlock Apple Game Center achievements.
Achievement | How to unlock
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| - Complete all Attack missions.
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- City is Yours! (20 points)
| - Open all locations in the City.
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| - Kill 25 enemies in a row without getting hurt.
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- Killing Machine (40 points)
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| - Complete all Robbery missions.
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- Sniper Killer (40 points)
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