Here is the full list of all 10 COLLECTION of SaGa FINAL FANTASY LEGEND achievements.
Changed game speed settings.
First played FINAL FANTASY LEGEND. (English or Japanese)
Viewed the title screen.
Viewed the options menu.
First played FINAL FANTASY LEGEND II. (English or Japanese)
First played FINAL FANTASY LEGEND III. (English or Japanese)
Completed FINAL FANTASY LEGEND. (English or Japanese)
Completed FINAL FANTASY LEGEND II. (English or Japanese)
Completed FINAL FANTASY LEGEND III. (English or Japanese)
Completed all FINAL FANTASY LEGEND titles. (English or Japanese)