Beating Halo: Reach on Legendary on solo?

Alex

New member
I played the first five levels then I got to the sixth mission. I turned off my game at that point. When I turned it back on and played campaign, it reverted me to my most recent save, the start of the fifth level. I don't want to play it again. The 6th mission has already been unlocked. Will this affect the solo achievement even though I beat every mission, but not according to my previous save?
 
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