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I recently just became a Spartan Officer and i didn't get the achievement or the helmet. What do i need to do to get the achievement and helmet?
is that your overal rank or your rank in a paticular playlist?
You need to earn 50exp in a single playlist. Your current highest exp is in Slayer with 24.
You should read the achievement description more carefully "Get to the rank of Lieutenant in any playlist in the new EXP progression system"