I played half-way through legendary on Reach, the campaign reset and I'm just wondering if I could play through the levels I already beat on easy THEN beat the other levels on legendary would I still get the achievement for beating the game solo legendary? Does the achievement system save those levels I beat, or to unlock the achievement will I need to have all levels marked beaten at the same time?
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Don't know, but all you can do is try each earlier level again until it comes back. It isn't like Reach on Legendary was actually hard. Noob combo the Elites, and your good.