There are two achievements in question that will not unlock: 1) Raider. 2) Suited for War.
I have completed the raid twice, and currently have several exotic and legendary weapons and items that I use/have equipped.
I tried what was suggested in the help section regarding this: where I sign out, start destiny, then sign in once prompted at the start menu. At first I thought it might be a problem with xbl, given their recent issues, but I have received achievements in other games during this time, so it is a destiny issue.
For the "Suited for War" achievement, I have tried to equip all rare items then re-equip my legendary/exotic items but still nothing.
For "Raider," I'm just hoping that completing the raid this week will unlock it finally.
If anyone has any suggestions, it would be greatly appreciated.
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I'va also had this problem for a couple of achievements, including these 2, but they randomly popped up for me on next day or so.. So maybe this will happen to you to?