defeat 20 enemies with headshots
Defeat 75 enemies in a row without dying不死连续打倒75个敌人 Defeat 20 enemies with headshots完成20个爆头 Defeat 100 enemies with headshots完成100个爆头 ..
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defeat 20 enemies with headshots
爆头击杀20个敌人
以上为机器翻译结果，长、整句建议使用 人工翻译 。