Sorting on Taxonomy in archive page

You did not specify a taxonomy term in tax_query. It should go:

'tax_query'      => array(
   array(
    'taxonomy' => 'taxonomy_name', // my guess
    'field'    => 'name',
    'term'     => 'Term name'
   ),
 ),

I prefer using ‘field’=>’slug’ in such cases as term names are more likely to be changed.

And also change order by ‘title’ to ‘post_title’as Abhisek mentioned in the comment.