This is only a little wrinkle, and mightn't be worth the effort to iron it out, but I'll be the pedant that points it out, and others can decide whether such minutiae are worthy of attention...
The order of the achievements in my profile (http://beta.glitch.com/profiles/PHVE3663QE222O9/achievements) is a bit erratic; it seems like it is based on some internal ID, which has sequentially numbered the achievements as they've been created. So "Bacon Biter" is not immediately to the right of "Piggy Nibbler", for example; and the more recently created dirt/peat achivements are at the bottom, amongst the "... Completist" badges, when one would expect them to be near the tree-related achievements, perhaps. This is only a minor annoyance now, but as the game is extended and further achievements added, the ordering will presumably get increasingly illogical...
Note that I'm not referring to the Encyclopedia page (which has a Greasmonkey script that orders the achievements and greys out the completed ones), but the achievements section of a user's profile. Nor am I suggesting that we necessarily need an interface to sort the achievements ourselves (which has popped up in the ideas forum already); just that it'd be neater if there was a consistent logic behind the order.