Requests that Steam fetch data on the percentage of players who have received each achievement
for the game globally.
This call is asynchronous, with the result returned in GlobalAchievementPercentagesReady_t.
public static SteamAPICall_t RequestGlobalAchievementPercentages() { InteropHelp.TestIfAvailableClient(); return (SteamAPICall_t)NativeMethods.ISteamUserStats_RequestGlobalAchievementPercentages(); }