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You'd better ask this on the official forums, there are lots of achievement hunters.
A quick Google search reveals that indeed they are bugged from time to time, some of it might resolve with the weekly maintenance, some might not.
http://us.battle.net/d3/en/forum/topic/12880048016
http://us.battle.net/d3/en/forum/topic/12943834477
http://eu.battle.net/d3/en/forum/topic/10831563159
Good luck with that achievement. I STRONGLY recommend joining a community for a concerted effort in getting that achievement, though...
You'd better ask this on the official forums, there are lots of achievement hunters.
A quick Google search reveals that indeed they are bugged from time to time, some of it might resolve with the weekly maintenance, some might not.
http://us.battle.net/d3/en/forum/topic/12880048016
http://us.battle.net/d3/en/forum/topic/12943834477
http://eu.battle.net/d3/en/forum/topic/10831563159
Good luck with that achievement. I STRONGLY recommend joining a community for a concerted effort in getting that achievement, though...