I have maxed my vanguard marks for the week and gotten over 777 grimoire score and have yet to get either the Valorous achievement or the Lucky 7's achievement. My Xbox GT is PlatinumFlyTrap.
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Hey sorry I cant help you just wanted to say that its the same for me. besides these two, I'm also not getting the decryptologist, use of weapons and notorious achievements... The more its posted the more awareness it gets hopefully.
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Got it, tried this out yesterday and it works: Ingame, go on pause, settings, log out and switch profile. Choose the profile you're missing the achievemetns and log back in with it.