http://forum.square-enix.com/ffxiv/t...en-pensez-vous

This is a post analysing the Achievement System from every angle (combat, DoW/DoM battle classes, crafting, exploration, etc.

Quote Originally Posted by Youmukon View Post
Bonjour ! Good day!

Comme le dit Freud dans son message, les évènements saisonniers ne sont disponibles que pendant une période de temps limitée, c'est pour cette raison que ces derniers rapportent beaucoup de points.
As indicated by Freud in his message, the Seasonal Events are only available during a limited period of time, this is the reason for which these events earn players a large amount of (achievement) points.