This Steam Community post announces open beta testing of Steamworks support for Red Faction: Guerrilla is now underway, as Volition progresses on removing reliance on Games for Windows LIVE from the shooter sequel. Here's how this works:

Red Faction Guerilla Steamworks Open Beta!
Today I would like to invite you all to participate in the public beta of Red Faction Guerilla with full Steam Support and complete Games for Windows Live Removal.

-) Matchmaking and Multiplayer via Steamworks
-) No Games for Windows Live sign-in required
-) Leaderboards via Steam
-) Voice Chat via Steam
-) Achievements via Steam
-) Uses DX9 Renderer by default as DX10 created a lot of problems and resulted in performance drawbacks (that should also fix Win8 issues)
-) At first launch the game attempts to migrate savegames from GFWL to the new system

To access the beta please do the following:
Follow this guide http://ds.nordicgames.at/SteamBetaBranchGuide.jpg
Under Step 1 select of course the Red Faction Guerilla App
Password for step 4 is: nordicrfgbeta
The branch for Step 6 is named publicbeta

I would like to invite everybody to report errors and bugs here so we can further improve the game.