A Boolean value that states whether this achievement is initially visible to players.
- iOS 4.1+
- macOS 10.8+
- tvOS 9.0+
- watchOS 3.0+
If the value of this property is
NO, this achievement is always visible to the player. If
YES, the achievement is not displayed in any of the standard achievement user interface screens. It remains hidden until the first time your game reports progress towards completing this achievement.