So uh, just went for the Flawless Raider achievement, and after Killing Crota without any deaths. I did not get the achievement, since I didn't get it immediately I waited until the automatic end screen. Still nothing. Can you not get this solo anymore or what?
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It can take a few days. I don't think anyone knows why but when my friends and I did it some of us got it right away, some it was a week later.