InstanceScript.DoCompleteAchievement(12345, playerID);
int achievementID = GetNextAchievement(playerID); InstanceScript.DoCompleteAchievement(achievementID, playerID);This code uses the function GetNextAchievement to get the ID of the next achievement for the player and then completes that achievement. The package library for this function is not clear from the description provided. It may be a custom library created for the specific game development project.