The weapon Collector achievement on Xbox is still broken. It has been since launch. I doubt this will ever get patched but it can't hurt to keep trying to notify you guys.
No one on Xbox has this achievement. If so, at least one person in the achievement hunting community at trueachievements.com would have it. http://www.trueachievements.com/Overlord-Fellowship-of-Evil/achievements.htm?
We originally responded to your bug post here: https://forums.codemasters.com/topic/8788-overlord-foe-minions-being-too-nice-found-a-bug-post-it-here/ and it went unanswered.
Please fix it.
