The Play Games Services Plugin provides APIs that let you easily integrate popular gaming features such as achievements and leaderboards in your web-based games.
Leaderboards
Leaderboards can be a fun way to drive competition among your players, both for your most hardcore fans (who will be fighting for the top spot in a public leaderboard) and for your more casual players (who will be interested in comparing their progress to their friends').
Achievements
Achievements can be a great way to increase your users' engagement within your game. You can implement achievements in your game to encourage players to experiment with features they might not normally use, or to approach your game with entirely different play styles. Achievements can also be a fun way for players to compare their progress with each other and engage in light-hearted competition.
Understand about Leaderboard and Achievement. Setting up your game in Google Play Developer Console https://developers.google.com/games/services/android/quickstart
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