Please don't necro old threads about the same issue you already created a topic for and also please don't bump this thread every few minutes.
Did you followed @JanePhoenix suggestion and tried a different save game? A save game that is older than the one you use now.
FYI, I informed the EA CMs bout this problem.
EA CM = Electronic Arts Community Manager.
But there is unfortunately no additional info for you.
Sometimes it is simply not possible to determine why a specific achievement will not unlock.
@JanePhoenix post has valid information regarding things you can try and requirements that must be met to unlock the achievement.
Did you tried the different save game we both suggested?
