As annoying as it is to trip over starvers when you're buying fodder, it's probably equally difficult to find them when you're actively looking for them. (Although, I haven't checked, but I'm going to guess there are at least a few enterprising folks direct-selling their unwanted starved dragons on the forums.)

It's not a problem for me personally - I've got a couple permas who always go hungry since I don't usually convert their obligate food type - but the site-encouraged habit would seem to be, as many players do, using the feed-all action whenever there's a tickdown, which you'd need to suspend for quite a while to get this achievement naturally.