Increment an achievement.
Achievement takes two parameters:
androidID the achievement ID for Google Play Games.
steps If the achievement is of the incremental type
you can use this method to increment the steps.
Unlock an achievement.
Achievement takes three parameters:
androidID the achievement ID for Google Play Games.
iOSID the achievement ID for Game Center.
percentComplete the completion percentage of the achievement,
this parameter is optional on iOS/macOS.