According to GalbadiaX.com, the next update of Final Fantasy XI for Xbox 360 could introduce gamerscore points into the aging MMORPG. To date, FFXI is the only 360 title without points, which, technically, Microsoft requires publishers to include in Xbox 360 games, dispersed throughout at least five game-related achievements.
If you view Final Fantasy XI details on an Xbox 360 gamercard, you'll notice that the game has been updated with 32 "secret" achievements. However, these achievements are not yet active, but are speculated to become fully integrated with the next FFXI update, which will also include changes to Besieged and chocobo breeding.