"THe Development Team Does Not Currently Have Plans Too..."

[Afania]

There is nothing wrong with asking for an achievement to take less than 4~6 months.

There are plenty of achievements that take less than 4~6 months in FFXI. If you dont' like 4~6 months goal choose another goal.

Also it's cheaper/faster to design a content/goal that takes 4~6 months and rely on less version update to keep the game alive. If every goal only need 1 month to accomplish, the dev would have to release content a lot faster than it currently is to keep players playing for more than 4~6 months.