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Setup

Enable Feature

Open Essential Kit Settings and enable Game Services feature in the inspector.
Enable Game Services

Properties

Properties
Leaderboards
Achievements
Android Properties
Name
Description
Leaderboards
List of leaderboards for your game goes here
Achievements
List of achievements for your game goes here
Show Achievement Completion Banner
This is used (on iOS) to show a banner once achievement is completed
Android Properties
Properties specific to Android goes here

Leaderboard Properties

Add a leaderboard
Name
Description
Id
This is the identifier you use to refer the leaderboard within your code
With this id, you can refer the leaderboard irrespective of the platform you are on.
Platform Id
This is the identifier which is specific to a platform. Usually these are the id's you see in iTunes Connect and Google Play Game Services dashboards.
Platform Id Overrides
If the platform id is not same among all platforms, you can set id per platform. Just enter the specific id under the listed platform.
Title
Title for this leaderboard

Achievement Properties

Add an Achievement
Name
Description
Id
This is the identifier you use to refer the achievement within your code
With this id, you can refer the leaderboard irrespective of the platform you are on.
Platform Id
This is the identifier which is specific to a platform. Usually these are the id's you see in iTunes Connect -> Game Center and Google Play Game Services dashboards.
Platform Id Overrides
If the platform id is not same among all platforms, you can set id per platform. Just enter the specific id under the listed platform.
Title
Title for this achievement
Number of Steps to Unlock
If the achievement is an incremental achievement (an achievement which needs steps to complete it), you need specify the number of steps it takes to finish this achievement. For one-shot achievements, this value should be 1.

Android Properties

Name
Description
Play Services Application Id
This is the project id mentioned for your app in Google Play Console -> Grow section -> Play Games Services -> Setup and Management -> Configuration
ex: 113386462231
Server Client Id
In Google Play Console -> Grow section -> Play Games Services -> Setup and Management -> Configuration, Add a credential for web and set the value of Authorization -> OAuth Client id here.
This is optional and is only required if you access play services from your backend.
⚠️
If you set this id from non-web app oauth client, sign-in fails.
ex: 113386462231-pn0ikkcmrxxxxup8gben.apps.googleusercontent.com
Show Alert Dialogs
Enabling this will show alerts UI related to sign in failure and other possible errors.
Display Popups at Top
Enabling this will show all banners (Achievement revealed, unlocked) at top. Else at bottom.
On iOS, there is a feature to move leaderboards and achievements to groups. Considering you may deploy your game to other platforms(OSX) in future, its good to move them to groups from start. This avoids changing them later once you have your other versions live.
Achievements/Leaderboards in groups need to start with "grp." prefix and should be unique. We suggest to follow something like "grp.com.companyname.gamename.leaderboardname". Ex: "grp.com.voxelbusters.flappybird.highscoreleaderboard"