For the last two week i was trying to get the Halo Reach achievement: "A Monument to all your sins".( Complete legendary campaign, alone) and which i was trying very hard to get. will i gotten seven of the nine mission done alone, (One of the mission Exodus took me 2 hours to complete!!!) After the 8th mission though i checked my progress. To my dismay i found out that apparently all of my progess was gone! it said that i nevered played the first mission and that all my other missions were locked. (have to beat the mission before that till it is unlocked.) i completed the last mission knowing that i was not likely to get the achievement, and after firing the MAC cannon to the corvette ship at the very end and watching the final video and not seeing those achievement pop up i was let completely down. if you check my progress it will say that the last two mission were done and completed on only alone legendary and that all of the other mission were locked. if i was lieing then how did i unlock the last to mission and not all the others? if you check bungie it says that i completed the campaign on legendary. but yet no achievement on xbox live. and if you complete that achievement you also get "Gods Must Be Strong" (complete campaign on legendary alone or co-op) and "Folks need heros..." (complete herioc campaign") i would get that one because legendary is the hardest campaign to beat and you would get all the lesser difflculty campaign achivements done (Herioc was the only other one i needed). Please bungie says i gotten the campaign done. I almost gotten all the achievements done just needed 2 others and i will have them all. PLEASE dont make me do that campaign alone again.