Same. Even playng on Pure Survival that message saying "Hardcore mode completed" appeared. I was so happy after finishing Hardcore only for see that the achievement for it wasn't there. All my effort to waste (and time). Yeah, they messed something up after deleting that achievement
I have similar issue but with Pure Survival Mode.
It is important to note that I've never ever started Pure Survival Mode. I was in the middle of my Hardcore Mode. Somewhere at chapter 13 I stopped playing to take a break, and on main menu screen I got rewards for the completion of Pure Survival Mode. The rewards weren't fake because once I switched back to Hardcore Mode gameplay I could see in my inventory these Overclocked parts and some resources I haven't had before.
