Achievement | How to unlock
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300 Human Survivors | Completed Stage with at least 300 Human Survivors.
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5 Lives | The proud owner of five lives.. nice.
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Completed SkillShot | Finished all stages in Skill Shot Mode.
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First Blood | Smashed an alien.
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First Boss | Destroyed your first alien mothership.
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Survived 120 Seconds | Two whole minutes in Survival Mode.
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Survived 240 Seconds | Four whole minutes in Survival Mode.
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Survived 300 Seconds | Five whole killer minutes in Survival Mode.
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Zone 1 | Defending Old Blighty.
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Zone 2 | Defending Moscow.
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Zone 3 | Defending Tokyo.
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Zone 4 | Defending Toronto.
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Zone 5 | Defending Paris.
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Zone 6 | Defending Paris.
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Zone 7 | Defending New York.
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