private static function CalculateAchievementPoints()
 {
     if (!self::IsLoaded()) {
         self::LoadAchievements();
     }
     self::$achievements_points = DB::WoW()->selectCell("SELECT SUM(`points`) FROM `DBPREFIX_achievement` WHERE `id` IN (%s)", self::GetAchievementsIDs());
     return true;
 }