I want to add a category 100%, but the problem is that the impossible game has steam cloud protection sort of, so because of this all medals are not removed, can this problem be fix somehow?

Can't you use steam achievement manager? I know that it work to get rid of the achievements on steam. I don't know about the in game medals tho.

how I can to download SAM?

Well, it's working, thanks man!

But I have question, for use SAM he not to ban account on steam?