I went to customize my spartan and I cannot find my helioskrill armor and I have the legend achievement?
I saw a lot of people today on the forums complaining that the achievement wasn’t working as expected. May want to do a search see if any of them found a solution or if any of 343 guys chimed in on any sort of review of what is going on. I dont have the issue so I haven’t been keeping an eye on it, but thats my recommendation.
Good luck, hope it gets fixed for you!