Sorry if this question is silly, but I'm curious about the "is a gem" title. I've looked at every list I can find, but I can't find specifically how to obtain it. The achievement isn't retired, and it says you have to help Mattieu find his missing jewels... But wasn't that an event from years ago? Should this be retired, or is there still a way to get the title? I'd really love to have it, as well as the book that comes from the achievement!

I think it is supposed to be retired, but it was perhaps mistakenly unretired recently when there was the issue with all of the forum titles being deleted.

Yeah, I suspected so. It might actually be an issue with me searching for the achievement by name and it mistakenly showing as unretired. Or both, who knows. Well this is a little disappointing, but maybe one day that title will be brought back for something else. I can always buy the book.

Thanks for the answer! c: