Achievement Sort Order Not Working


I am pulling the achievement list to a custom widget and seems to work fine. The problem I am facing is that I need the functionality to pickup achievements based on oldest achievement created.

#set($achievements = $core_v2_achievement.List("%{Enabled='true', SortBy='DateCreated', SortOrder='Descending'}"))

If I change the sort order to ascending or descending, the order remains to be same. There seems to be no change while pulling the data. Is there any way to pull achievement list based on oldest achievement created?