You cannot activate any other retail-bought game even if you have all the receipts etc and it is in the steam store. There is also no way to 'pair' retail game with steam DLC or vice versa (that maybe be possible with DRM free steam base game, but I know nothing about it). It's sad, from all of my colection only SC is accepted, though I got FA kind of for free.
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Games on Steam that are also on the original Xbox, that I know of: Fable - The Lost Chapters. Jade Empire. Beyond Good and Evil. The Bard's Tale. BloodRayne. Bloodrayne 2. Broken Sword 3: The Sleeping Dragon. Brothers in Arms: Earned in Blood. Brothers in Arms: Road to Hill 30. Conflict Desert Storm. Deus Ex: Invisible War. Doom 3. Doom 3: RoE.
Get unlimited access to over 100 Xbox One and Xbox 360 games on Xbox One for one low monthly price. Play new games like Sea of Thieves and State of Decay 2, as well as Forza Horizon 4 and Crackdown 3 on the day they’re released, and enjoy a wide variety of games, from recent blockbusters, to critically acclaimed indie titles. Discover and download titles that you’ve always wanted to play.
Games and software that work natively with a 360 controller will recognize the Xbox One controller as a 360 controller. Also, for games that dont support controllers, there is a great app on steam, Controller Companion, that is less than 2 bucks, allows you to mimic mouse and keyboard functions, and even has keyboard support now too for the 360 chat pad.
Game: eFootball PES 2020 LITE: 49: 3,085: 40-50 hrs: Publisher: Konami Digital Entertainment, Developer: Konami Digital Entertainment Co., Ltd., Last check: 22 Jun 2020.
A collection of all the original Xbox games on Steam. All dates indicate North American release date unless otherwise specified. I'm drunk and this is very WIP.