wp_query for displaying attachments with a tag

So after some more digging was able to figure it out. Using the Advanced Custom Fields plugin, I created a text field that appears on attachments with specific tag applied to them. Now you can assign a value and I updated my WP_Query to reflect:

<?php   
    $args = new WP_Query(array(
        'post_type' => 'attachment',
        'posts_per_page' => -1,
        'oderby' => 'meta_value_num',
        'order' => 'ASC',
        'post_status' => 'any',
        'post_parent' => null,
        'meta_query' => array(
            array(
                'key' => 'logo_sort_order'
            )
        ),      
        'tax_query' => array(
            array(
                'taxonomy' => 'post_tag',
                'field' => 'slug',
                'terms' => 'logo'
            )
        )
    ));

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

?>

Hope this helps someone else.