I got MGS4 when I was around 16-17, I'm now 20 and played MGS4 so many times that I refuse to go through it again to get achievements that should have been in the game a year after they annouced their addition years ago. It's far too late to add them, MGO was closed, MGS4 is 4 years old, and I think everyone got their fill of it.
I loved MGS4, I think it's the best game I've played. It gives me chills thinking about MGO, but I've moved on and I don't think this was the ample time to do this.
Either way Konami and Kojima get props for listening to their fans, even though it's too late.