It seems like you are using the Management API. This is meant for management purposes only. Getting and setting goals.
If you want data from goals as well you want to be looking at the Core Reporting API.
The available data for goals can be found here: https://developers.google.com/analytics/devguides/reporting/core/dimsmets/goalconversions
The implementation guide can be found here: https://developers.google.com/analytics/devguides/reporting/core/v3/coreDevguide
I did not provide a full implementation example seeing that you already know how to setup the use of a Google API.
Good luck with you quest!
EDIT: Added an example on how to use it:
<?php
$client = new apiAnalyticsService();
function queryCoreReportingApi() {
$optParams = array( //OPTINAL SETTINGS
'dimensions' => '', //A comma-separated list of Multi-Channel Funnels dimensions. E.g., 'mcf:source,mcf:medium'. (string)
'sort' => '', //A comma-separated list of dimensions or metrics that determine the sort order for the Analytics data. (string)
'filters' => '', //A comma-separated list of dimension or metric filters to be applied to the Analytics data. (string)
'start-index' => '', //An index of the first entity to retrieve. Use this parameter as a pagination mechanism along with the max-results parameter. (integer, 1+)
'fields' => '', //Selector specifying which fields to include in a partial response.
'max-results' => '25'); //The maximum number of entries to include in this feed. (integer)
return $service->data_mcf->get(
$id, //Unique table ID for retrieving Analytics data. Table ID is of the form ga:XXXX, where XXXX is the Analytics profile ID. (string)
'2010-01-01', //Start date for fetching Analytics data. All requests should specify a start date formatted as YYYY-MM-DD. (string)
'2010-01-15', //End date for fetching Analytics data. All requests should specify an end date formatted as YYYY-MM-DD. (string)
'ga:totalConversions', //A comma-separated list of Multi-Channel Funnels metrics. E.g., 'mcf:totalConversions,mcf:totalConversionValue'. At least one metric must be specified. (string)
$optParams);
}