I managed to make analytics work putting this code inside the ajaxed div
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
ga('create', 'XX-XXXXXXXXX-X', 'auto');
ga('set', 'page', '<?php global $wp; echo '/'.$wp->request ;?>');
ga('send', 'pageview');
Tested on analytics real time, and the line ga('set', 'page', '<?php global $wp; echo '/'.$wp->request ;?>');
sends to GA the url. Using the code without this line will only update the page title not the url.
This are Google recommendations