incrementAchievement
Use this method to increment a given achievement in the given amount. For normal achievements, use the unlockAchievement method instead.
The method emits the com.jacobibanez.plugin.android.godotplaygameservices.signals.AchievementsSignals.achievementUnlocked signal.
Parameters
achievementId
The achievement id.
amount
The number of steps to increment by. Must be greater than 0.