Unreasonable demands or not........not one of the rights mentioned above is available here in Qatar. And as you said, if you complain against your teatment here you are fired.
So Fifa want Fifa's World Cup to be built without exploiting the work force......so to do this they will have to demand that the construction companies and government uphold some universally agreed basic standards.
It's a trade-off - workers get treated fairly and Qatar gets to bask in its vanity project. Simple really.