Achievements in progress gets reset every day!! For instance: how many diggles I've killed (out of 1000), it goes up a bit every day I play... then the next, it shows 0/1000.... This also happens to how many Deep omelets I've eaten, vandalism statues, potions crafted, and krong curses... Is this happening to anyone else?
Yup. Everyone, apparently. It's a bug from back in the dawn of time, though it's usually a bit more random than "every day" (unless it's evolved for the latest version). The stats, as well as my own experience, show that all progress-based achievements are obtainable, so you just need a lot of playing and a lot of luck.
I think I'll have to get them in a single session then... it's getting kinda frustrating... hope they fix it...