Version 4.6.0

applications/calendar/api/events.php

@@ -489,6 +489,8 @@ class _events extends \IPS\Content\Api\ItemController
 				'rsvp_date'			=> time(),
 				'rsvp_response'		=> (int) \IPS\Request::i()->response
 			) );
+
+			$member->achievementAction( 'calendar', 'Rsvp', $event );
 			
 			return new \IPS\Api\Response( 200, NULL );
 		}