Rainbow Six 2 Achievement Glitch

[Corrupt]

I have done the whole story mode on realistic difficulty and i havent got the achievement. has anyone had this same problem and does anyone know how to fix it? :S

[c[__]]

They may have fixed it un an update if they have go to dashboard then the far right blade then select memory and press Y on your hard drive. Then, press X X LB RB XX.

[Corrupt]

what do those buttons do

[Neil]

what do those buttons do

They reset your harddrive or something

[Corrupt]

does that mean delete everything off it?

[c[__]]

Removes any updates that you did from games. I got this off of http://www.xbox360achievements.org/forum/index.php.

[Jord]

It removed all updates

[Alan_Carr]

I only need 2 more acts and ive done it on realistic, so ill see if i get it..

[Agent 47]

all you need to do is play the first mission again with someone else hosting it. get a friend to do it for you.