public static function achievement_data( $email_address, $page ) {

		$data = array();

		$student = self::get_student_by_email( $email_address );
		if ( ! $student ) {
			return self::get_return( $data );
		}

		$achievements = self::get_student_achievements( $student );
		if ( $achievements ) {

			$group_label       = __( 'Achievements', 'lifterlms' );
			$group_description = __( 'Student achievement data.', 'lifterlms' );
			foreach ( $achievements as $achievement ) {

				$data[] = array(
					'group_id'          => 'lifterlms_achievements',
					'group_label'       => $group_label,
					'group_description' => $group_description,
					'item_id'           => sprintf( 'achievement-%d', $achievement->get( 'id' ) ),
					'data'              => self::get_achievement_data( $achievement ),
				);

			}
		}

		return self::get_return( $data );

	}