Killed more than 300 didn't got the maiden...

Hi, I killed more than 300 enemies yesterday, and today I see I didnt get the Maiden... why?
If you can help me please, i want to complete the event, plus, it was really hard because many errors while I'm playing (i play knife modes) and I was really tired. So, please help me or If you cant tell me a solution, to stop doing this event because i was trying to get the Xmas axe and now I can't, my IGN is [Tec]House.

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