Can anyone tell me if they're having the same problem? I beat the game on supersoldier difficulty. Even the in-game menu acknowledges this. But my achievements only indicate I beat the game on Veteran.

Ya same thing happened for crysis 2.

Not for me. I beat it on regular (soldier I think in C2), then again on Supersoldier and it unlocked for me (along with the Veteran achievement). Maybe the OP should try that, although in reverse order obviously.

Same thing happened to me.

I never had this issue in Crisis 2. Although I did beat it on normal for the first time through. So you're saying I should just replay Crysis 3 on normal?

Can anyone tell me if they're having the same problem? I beat the game on supersoldier difficulty. Even the in-game menu acknowledges this. But my achievements only indicate I beat the game on Veteran.
the same here+I did not get an achievement for complete 3of7 levels on supersoldier(only for veteran)

Same thing happened to me on Crysis 2. Completed the game on a higher level and had to replay the entire campaign to unlock the higher level achievements. That's why I'm starting with veteran this time! Hopefully I won't have to replay on normal.