I just got promoted to Lieutenant (which is in the Spartan Officer ranks), yet I didn't get the achievement for ranking up. Is there some sort of problem with this achievement, or am I missing something?
EDIT: For some reason, my H3 stats page doesn't list me as a Lt. However, it does in the game. I have the Spartan Officer insignia in-game as well. Hmm..
[Edited on 07.25.2011 4:47 PM PDT]