I found a method to get every skin in store for free.

Now this is not an exploit or a hack. It just requires your time. Now with this method it's upto you to decide if you worth money more or time. The method is to make new accounts do the achievements and give it as a gift to Ur main account. I have done this as I have a free account where is just play to try different things and have fun. I got into getting achievements and I thought why not just buy skin from the units I collected and gift it to my main. now as you will obviously run out of achievement unit and battlepass units you can just create more accounts and keep doing this.