Board Thread:Questions and Answers/@comment-71.227.163.77-20130623190443/@comment-207.179.210.63-20140602042945

(this might not fix your problem) when your achievements get reset, all you have to do is throw down whatever item the achievement is for and pick it up again, that usually fixes it (this won't help with achievements such as "Cow Tipper" or "monster hunter")