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The Game is not fully connected to the Steam API Things as playtime or Achievements will not be Tracked.
Butt there was a Workaround in past butt i dont know how and how it works
Edit: if found this Old Outdatet Post on steam maybe it could be helping to find a simular Solution. https://steamcommunity.com/sharedfiles/filedetails/?id=2837933831
Hey i wonder if its Possible to Play the Black Ops campaign in a Coop Setting like WAW. With a Workarounds, Mods or Launching the Maps on a Server cuz it should be same base as the Zombies gamemode.
If you have any help or knowlege
feel free to post it 
EPICNinjaYT Du kannst auch dein eigenen BO2 Plutonium Server machen klingt nach viel Arbeit aber,
vlt kann das ein neben Projekt in den Ferien sein!
HexplosiveMCOG Hey do you have a VAC BAN in BO1 ???