Bungie literally gave this info earlier today, I should know, I've been checking it all day to see if any progress has been made on the triumphs issue. It is under the 9/17 updates on the main bungie help post, first item in that section. Follow the link and read the instructions, there are seperate methods for Xbox and playstation which is why some people replying to this post said it didn't work for them. The above method is for the Xbox version.