With the fancy new newsfeeds, upon reading that so-and-so has earned such-and-such, if one clicks through to the achievement, one sees a personalized (for so-and-so) page about that achievement, stating how many glitchen have achieved it. But it doesn't say whether I have achieved it, and it doesn't include related achievements (or say if I've achieved those). Description aside, those are -- and I fully understand that this probably makes me A Bad Person -- really the only two things I care about.
That information used to be there. Maybe it could return? Otherwise, digging that information up requires a whole separate slog through my achievements page and/or the encyclopedia, which, ugh.