I just thought I'd mention that there are also DS and PC versions of that Neopets thing...and they have a weird system for recording achievements (the Wii version either doesn't have them or they're not available on the site yet). Basically, if you unlock one in the game (nine of the ten achievements in the DS version are stupidly easy, though I don't know how I'm going to get 2000 experience from placing a single piece - by the way, the game itself is like Othello meets PuzzleQuest, which is pretty much just as bad as it sounds), you get a code that goes in on the promotional page on the website, and you get stuff on your Neopets account. You also get puzzle pieces showing that you've gotten achievements...and two of the puzzle pieces are earned for having five achievements and probably the other is gotten for having all ten.
EDIT: Never mind, the thing on the website is a promotional tool, and a broken one at that.
Why do I care at all about this stuff? I recently logged into my 66-month-old Neopets account (donotcare95; it's the first place I used that username) for the first time in ages, and I've been messing around with stuff on it a bit, playing new games, realizing how easy some of the older games actually are, stuff like that.