Hexing achments all around is asking for a Ban.
If you want to cheat for gamerscore, Dont Hex instead GameSave and SPG it is a lot safer! ( You still can get banned )
If Your still gonna hex i would use it on offline profiles only.
What i was gonna do was use it to get an acheivement for halo 3 like two for one. does anyone know of a achment modder that wont get you banned from an online account?