You need to complete this steps to integrate into your game Google Achievements and / or Google Leaderboard service.
Let's begin ;-)
Open Google Play Developer Account
GAME SERVICES => SET UP GOOGLE PLAY GAME SERVICES
Type GAME NAME, select game category and press CONTINUE
Submit following information:
- Display name
- Feature graphic
LINKED APPS => ANDROID
Select PACKAGE NAME of your game and press SAVE & CONTINUE
AUTHORISE YOUR APP NOW
This is your APP ID
CONGRATULATION! You successfully setup GOOGLE PLAY SERVICES into your game!
Please remember your APPLICATION ID and let's move forward: