Change the users progress on reaching a named achievement, the name must match the Achievement ID given to the achievement in iTunes connect, Google Game Services, or GameCircle. The iPercentageComplete values should be between 0 and 100. However, for incremental achievements this value is actually the number of steps completed and may be outside of this range. The value will overwrite the current percentage or steps completed of the achievement.
GameCenterSubmitAchievement ( szAchievementID, iPercentageComplete )
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