Base plugin/example extension for adding support for other plugins to the Achievements plugin for WordPress. https://wordpress.org/plugins/achievements/

gistfile1.php

<?php
/**
 * Welcome to your first Achievements extension.
 *
 * Edit this base plugin, and then save it in /plugins/. You'll want to start by replacing
 * the example class/function prefixes, and fill in the actions that you want to integrate
 * into Achievements in the constructor's `$this->actions` array.
 *
 * For more information, see http://achievementsapp.com/developers/adding-other-plugins/.
 * For support, post on https://wordpress.org/support/plugin/achievements/.
 *
 * Version 1.
 */

if ( ! defined( 'ABSPATH' ) ) exit;

// This safely loads your extension.
function pg_init_your_extension() {
	achievements()->extensions->your_extension = new PG_Your_Extension;

	// Tell the world that your custom extension is ready
	do_action( 'pg_init_your_extension' );
}
add_action( 'dpa_ready', 'pg_init_your_extension' );

// This is the actual extension.
class PG_Your_Extension extends DPA_Extension {

	public function __construct() {
		/**
		 * Key/value pairs = action name/action description.
		 * Replace these with the actions that you want to add support for.
		 */
		$this->actions = array(
			'eat_pizza' => __( 'The user eats a pizza', 'your_textdomain' ),
			'eat_cakes' => __( 'The user eats all the cakes', 'your_textdomain' ),
		);

		/**
		 * These bits of information are important. `id` should be a short, unique string for the name of your extension or plugin.
		 * Don't include any spaces, punctuation, or other weird characters.
		 *
		 * Incrementing the version number won't do anything automatically. Look at the `do_update()` method in the `PG_Your_Extension` class.
		 */
		$this->id      = 'your-plugin';
		$this->version = 1;

		// All the rest of this is information to populate the details for your plugin in the [wp-admin > Achievements > Supported Plugins] screen.
		$this->contributors = array(
			array(
				'name'         => 'Paul Gibbs',
				'gravatar_url' => 'http://www.gravatar.com/avatar/3bc9ab796299d67ce83dceb9554f75df',
				'profile_url'  => 'http://profiles.wordpress.org/DJPaul/',
			),
		);

		$this->description     = __( 'This is a sample Achievements extension for a fake plugin called "your-plugin".', 'achievements' );
		$this->name            = __( 'Your Extension', 'your_textdomain' );
		$this->image_url       = trailingslashit( achievements()->includes_url ) . 'admin/images/buddypress.png';
		$this->rss_url         = 'http://buddypress.org/blog/feed/';
		$this->small_image_url = trailingslashit( achievements()->includes_url ) . 'admin/images/buddypress-small.png';
		$this->wporg_url       = 'http://wordpress.org/plugins/your-extension/';
	}
}