Which ones did you think you are missing?
Keep in mind a few things;
The achievement is based on one character so if you have some spread out in others they won’t count for achievement. It was a little unclear if you were talking about this character specifically or meant your account as a whole.
Edited to add: This was changed in 8.1, now reps are account wide for this achievement!
-Not all reputations count. Renown, things like “best friends” from Tillers, etc don’t. If the reputation doesn’t specifically say Exalted then it won’t be counted for the achievement.