1) Allow us to replay mission battlefields.

A lot of us like to play FFXI for the missions and story, but once we clear the battlefields we cannot attempt them again unless we tag along with someone else who needs to clear it. Please allow us the option to revisit these battlefields so that we may enjoy them again. At the moment, it is only possible to re-attempt add-on scenario missions because they have rewards. I hope that we can replay missions easily. No rewards are necessary either.

2) Implement an achievement system.

It would be nice for FFXI to have an official achievement scoreboard for players to keep track of their progress in the game. At the moment, the game already records achievements such as clearing events and killing NMs (and uses this for synthetic atma in Abyssea), so I hope a similar system is introduced to cover the entire game.
I would like to see achievements for mission completion, HNM kills by category, and event clears. I also understand that titles do something like this, but they are not centralized and don't cover every aspect of the game.

3) Introduce a bestiary.

Ok, maybe a bestiary is unrealistic because of how many monsters FFXI has. But a lot of players are interested in the enemy's max HP and level statistics. Could you introduce a way for players to find out about this? It would be best if this was an ability in game. Alternatively, it would be nice if you had an article every week or 2 weeks about special monsters in FFXI and some information about them.. maybe a secret about some NMs that have not been discovered by players. I think players would be very interested to know how rich the game really is.