I guess it could have been clearer, but for this I just used the achievement that included the last boss, assuming that players are able to kill the ones that come before the last few.
Originally Posted by Deployed
I'll come back and update this chart again at some point in a few months to see how things have changed (if I remember!).
Yeah, I'll try and see what I can do about player completion dates. Character completion dates are much easier! Added the quick output for that below.
As long as shared achievements are on they will show up as belonging to the same player. I started with a sample of characters we used in Cataclysm, updated all of them, updated all of their guilds, went through auctions a few times to get more guilds. I would imagine this caught a significant number of players, but it will likely take another month or so to get an even better sample.
Originally Posted by banur
I don't use pets right now as only ~2% of characters have account wide achievements off, so they just aren't included in any samples.