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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Bungie no longer manages the Halo franchise, the Halo franchise is currently under the control of 343i. You could try asking your question in the gaming forum or at www.halowaypoint.com.