$the_query = new WP_Query( array(
    'post_type' => 'attachment',
    'category_name' => 'photos',
    'posts_per_page' => 25,
));

while ( $the_query->have_posts() ) : $the_query->the_post();

$attachment_data = wp_prepare_attachment_for_js($attachment);

      echo '<div><div>
      <img src="'.wp_get_attachment_url ('medium').'"/>
      </div><div> List of Posts Go Here </div>';

      endwhile; wp_reset_postdata();?>