My current reference number is: 1194948792
My former reference number was: 1192672816
I owned an original Xbox 360 which I played exclusively offline. It stopped working Fall 2012. I opened a new Xbox 360 at the beginning of January and transferred the data from my old machine to my new machine. It showed that I had a Gamerscore of 41,000+
With this new 360, I signed onto Xbox Live for the first time ever. I noticed that my Gamerscore dipped to 37,000ish. The achievements I lost were all related... they were the first achievements I had ever done. While 3 games were completely wiped out (Call of Duty 2, College Hoops 2K6 and Oblivion), several games only lost some achievements (Top Spin 2, Gears of War, Hexic HD). The achievements I lost on those games seemed to be some of the first achievements I got in those games while newer ones remained.
The resolution to my first reference number was to play games again. While it is disappointing to lose hundreds of achievement-based gaming hours, I did try this.
My new situation is that I cannot 're-achieve' some of these achievements. In Hexic HD, the 5,000 combo achievement either wasn't lost or re-popped when I entered a game; however, the 25 combo achievement refuses to budge. I have tried deleting the game and re-downloading it (as well as doing that with my profile) to no avail.
In Top Spin 2, I am unable to get the two achievements for defeating all of the male and female players in exhibition mode (have beaten them all in doubles and singles in a multitude of set lengths). My guess is that since I already beat them before, I can't beat them for the first time again.
While I haven't tried Gears of War again yet, I'm worried I may find the same problem here. I have the achievements for completing all levels as Dominic and for collecting all of the COG tags; however, I do not have the achievements for collecting 1/3 or 2/3rd of the COG tags... or for completing 1 or 10 levels as Dominic. I have the achievement for completing all Acts on Hardcore difficulty... but not for completing Act 1 on Hardcore difficulty.
On Call of Duty 2, the game shows that I have completed every level on Veteran difficulty, yet the achievements are gone (have not tried re-achieving them yet).
Is there any fix for getting these achievements... particularly the ones I have apparently passed the initial requirement (25 combos, beaten tennis players) and can't 'reset' the game to allow me to get it again?