WTF??? No achievement?

[Meat shield]

I finshed the game on solo Heroic last night. However when i first beat the last level, before loading the final cutscene it came up with the "disk unreadable, please clean etc" error. I did this ans when i put it back in my game hadnt saved, resulting in me having to do the final level again, which was annoying enough, but anyway, once i did it again, i duly got the cutscene and credits etc. Then i got my achievements for finishing the whole game on Heroic(and Normal cos it unlocked as well), but for some reason it didnt give me the achievement for beating the last level? I tried beating the last level for a third time just to get it, but it still didnt come up. Anyone got any ideas?

[Leo]

hmmm... thats strange i did it and it gave it too me straight away... odd

[Martino]

Try getting another achievement, to sort of, wake up your profile. If that doesn't work then it's probably a glitch which will be patched soon.

[Beatle15]

yer what they said try a skull one or something maybe it will unlock altogether.

[Meat shield]

Maybe i'll try that, just thinks its wierd, and cant help thinking its connected to the disk error i got the first time i finished the last level, before the final cutscene. Cheers anyway lads.

[Meat shield]

Update, eventually got it to work by going back to the previous level(the flood level) and finishing the game AGAIN from there. Its a bit wierd cos if you look at my achievements it looks like i finished the game before i finished the last level, but no matter . Cheers for the help lads.

[HaverXBL]

I had this problem with seventh level but i have sorted it out now

[JCC87]

You sure you not starting the level from point alpha or something?