Num enemies killed one
NUM_ENEMIES_KILLED_ONE47.1%

Achievements and their recorded unlock rates.
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NUM_ENEMIES_KILLED_ONEWIN_CAMPAIGN_MODEWIN_CLASSIC_PART_ONECAMPAIGN_MODE_WITHOUT_ROCKETCAMPAIGN_MODE_WITHOUT_BUBBLEWIN_CLASSIC_PART_TWOCAMPAIGN_MODE_WITHOUT_DYINGCAMPAIGN_MODE_WITHOUT_DAMAGING_ENEMYCAMPAIGN_MODE_WITHOUT_KILLING_ENEMYCAMPAIGN_MODE_WITHOUT_TAKING_DAMAGEWIN_CLASSIC_FULLWIN_CLASSIC_FULL_NO_SKIP