Sorry to hear you feel that way. The achievement system is something that was very new for 4.6. If you wish to see improvements in the system, the best way is to post this up within our suggestion area, rather than venting frustration in a post here. We are indeed receptive to constructive feedback.
With the item you are using here however, it has already been confirmed by my colleague that it is a bug. Within any software, you will get times there are bugs that need to be resolved. You appear to be reacting here before seeing the fix