15 mission battles not raids you can see them by clicking your profile and clicking medals in profile 
in medals you will se missions just click it then find the medal that shows your battles
if you try to make with raids its enough so dont try to make with raids and dont forget to take a screenshot please if this helps like it 
Thanks dude but i didnt read now i just did 15 raids and did put it in on the quest..
how can i help u?
its a difficult quest ?
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idk is it 15 raid battles or 15 mission battles??