I have on my library a no longer existent/extinct game on the Steam store. How does it exactly work?

[+Analbi]

Metro 2033

And by that, i mean how would it work with the achievements and such. Heck, i am not even able to start a proper discussion thread on that game to ask why is no longer on the Steam store because that discussions forum doesn't exist on first place!

The question, more than anything, is that how would these kind of situations work out. Aren't those defunct games no longer protected by DRM or something? I should feel lucky about having it after so long it was taken out of the Steam store? What if i do delete it? I'll no longer have it and be a total doo-doo for trashing that chance of playing it? (Even tho... i gotta confess i got it on a voucher i was gifted by buying a video card back on 2016)

How about you? Which game on your library is "extinct" as mine? Would the achievements and such still work? What does it exactly mean by simply "not existing" on Steam anymore?

[cSg|mc-Hotsauce]

Metro 2033 forum...

https://steamcommunity.com/app/43110/discussions/

Everything will work just fine. The game will stay in your library and achievements will still work.