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My friend and I beat the Halo 2 laso playlist today. I got the achievement, but he didn’t. It turns out that he didn’t do the heretic and armory prior to us starting the playlist. He went back and did those missions, but the achievement is still locked for him. Are there any potential fixes for this that don’t involve doing the playlist again?
I had him try restarting his console and his game, but that did not seem to do the trick.