Beatin it twice solo n it wont let me get my rank up achievement or to get to rank 11
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I assume you did the solos in one sitting without leaving to orbit. In that case you should have gotten the achievement for it in the Warlords Ruin tab in legends tab of triumphs. Once done that should unlock the node for Guardian Ranks. If you have redeemed that achievement then it is bugged, or you can try your luck with Ghost of the Deep.