First off, FUCK! Last night my friend and I beat Halo Anniversary on legendary, so the achievements should've popped, correct?

WRONG!

Apparently since i was saving t the cloud, the game didnt register me beating anynofnthe levels we did the previous nights. The game was telling me i completed the last two levels ONLY. So now if i want the damn legendary achievement, i need to play through again. Very very angry.....