I beat Halo 3, but I didn't get all the achievments, or the "Finished the Fight"

[fogdogsaysruff]

I beat Halo 3, but I didn't get all the achievments, or the "Finished the Fight"

message on multiplayer. WARNING POSSIBLE SPOILERS

I beat Halo 3, but all the achievements didn't activate. I have the achievement worth 50 points for beating the last chapter, and for finding the skull in the last chapter, but no achievements for beating the game, or for the first 7 or so chapters. I also don't have the "Finished the Fight" message on multi player, which I really wanted.

I beat the last 2 levels, Cortana, and whatever that snow level is called, with a partner over XBOX Live on normal difficulty. The other levels I beat on my own on normal. Maybe that has something to do with it, so I added that information.

If anyone has any information on how to get those achievements, without having to redo those levels if possible, please tell me.

 

[catsmeow150]

IThe expert level needs to be on Hard or expert to beat the game.

 

[Anthony A]

did u beat the game on easy if u do u cant cant the achievement but if u didnt i dont know what to do