Complete the following tasks to unlock Apple Game Center achievements.
Achievement | How to unlock
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| - Destroy 10,000 obstacles.
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| - Get 100 points in one round.
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| - Get 25 points in one round.
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| - Get 50 points in one round.
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| - Play 120 seconds without crashing.
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| - Play 60 seconds without crashing.
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| - Destroy 10 missiles in one round.
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| - Play 30 seconds without crashing.
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| - Destroy 25 rocks in one round.
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| - Fire 150 bullets in the first 60 seconds.
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| - Destroy 30 trees in one round.
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