From GameWatcher: “Red Dead Redemption 2 on PC is, if we follow Rockstar’s previous modus operandi, an inevitability, though it’s been a while since the game launched on consoles, and the company hasn’t peeped about the PC release at all.
Having said that, recent leaks suggest that PC release of Red Dead Redemption 2 may well be closer than we think, as code sleuths found references to PC achievements/accomplishments in the Rockstar Social Club source code.”
Source: N4G PC Red Read Redemption 2 PC release leaked by Rockstar Social Club