Very recently I solo'd Crota's End and I didn't die once. It was awesome, and I waited for my flawless raider achievement… but it never came. I checked the achievements and Flawless Raider is still locked. What happened? I need help.
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It took me about 2 or so weeks for the achievement to pop, I did a hard reset and all of tat stuff and eventually it popped up when I started my XboxOne.