Complete the indicated task to unlock the achievement.
Achievement | How to unlock
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| - Kill over 100 enemies in a single level.
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| - Kill over 1000 enemies in a single level.
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| - First 20 levels completed.
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| - Kill over 2000 enemies in a single level.
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| - Kill over 250 enemies in a single level.
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| - Kill over 500 enemies in a single level.
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| - Finish a level with only big guns.
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| - Finish one level of the extended campaign.
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| - Build a level with the level editor and finish the level.
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| - Upgrage 5 towers in a single level.
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| - First 65 levels completed.
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- Extended Campaign Completed (10)
| - Complete the extended campaign.
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| - First 45 levels completed.
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| - Finish a level with only lasers.
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| - First 10 levels completed.
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| - Finish a level with only rocket launchers.
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| - Kill 3 enemies with a single shot.
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| - Kill 5 enemies with a single shot.
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| - First 5 levels completed.
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