It seems this very issue pops up every 2 or 3 weeks. Although it is frustrating, it is not game breaking. Folks who were around when the party jawa was released can get 100% of the achievements on Tatooine. That's a perk. Folks who came later cannot, that's a bummer, but it is what it is.
What you claim is being denied to you has a flip-side--allowing newcomers to earn this achievement denies the exclusivity enjoyed by old-timers.