Complete the following tasks to unlock Apple Game Center achievements.
Achievement | How to unlock
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| - Earn a bankroll of $1,000,000.
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| - Earn a bankroll of $500,000.
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| - Complete the Bunker Buster mission.
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| - Complete the Encroaching Tanks mission.
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| - Complete the Enemy Squadron mission.
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| - Max out all upgrades for the F-14.
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| - Max out all upgrades for the F-16.
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| - Max out all upgrades for the F-18.
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| - Complete a level without destroying any enemies except for the boss.
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| - Complete a level without taking any damage.
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| - Earn a bankroll of $100,000.
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| - Blow up the ICBM and save the world.
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| - Complete the Relief Effort mission.
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| - Complete the Resuce Iceman mission.
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| - Complete a level using only Sidewinder Missiles.
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| - Complete the Stealth Attack mission.
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| - Max out all upgrades for all jets.
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| - Purchase an upgrade for a jet.
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| - Complete a level using only the Vulcan Cannon.
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