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This information is intentionally made obscure by Valve so developers don't try to manipulate it.

Having said that, from pure guesswork, I've seen those restrictions being lifted at around 200 reviews. No idea about wishlists, but sales on Steam are weighted more heavily than key activation.

And another guess for me is that I dont think wishlist matter. And that it takes steam purchases into concideration. Otherwise devs would abuse it like before and just make a mass giveaway with steam keys and ask people to review it.

I write you later or tomorrow with a few infos that i don't want to post here.
I am no dev but i work with my curation, beta tests and translations with a good bunch of them.

A quick google search gave me these results:
https://partner.steamgames.com/doc/marketing/tradingcards

• not really useful for this case, just some info on how to make the cards and stuff, but not how to enable it.

https://steamcommunity.com/tradingcards/faq

• FAQ for trading cards

• I have a game on Steam, how can my game participate?
  Instructions and tools for trading cards can be found under the Community tab of your App Admin in Steamworks.