Creating an index of all posts sorted alphabetically by custom taxonomy

I am currently trying to put together an index of all posts sorted alphabetically by my custom taxonomy ‘rating’. My code has been applied to a custom page template with some success. Here is an abbreviated version of my code (since the content of all the columns isn’t particularly important here):

<h1>Fantasy</h1>
  <table>
   <?php /////////////// Fantasy ///////////////
      $args = array( 'numberposts' => 100, 'order'=> 'ASC', 'orderby' => 'title', 'genre' => 'fantasy' );
      $myposts = get_posts( $args );
      foreach($myposts as $post) :
      setup_postdata($post);
      ?>
   <tr>
      <td><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></td>
      <td><?php if(get_post_meta($post->ID, 'Author', true)) {
         echo get_post_meta($post->ID, 'Author', true);
         } ?></td>
   </tr>
   <?php endforeach; wp_reset_postdata(); // END FANTASY // ?>
  </table>

I have two issues with this:

1. I have 20+ total genres. This means I have to copy-paste the code a lot, which makes for a clunky, messy template. I can’t think of a better way to do this, though, since some posts are assigned more than one category. If I called up all posts at once and added a ‘genre’ column, each title would only appear once with multiple genres listed beside it rather than multiple times, with a single genre listed each time. Is there a way to solve this that I haven’t thought of, or do I need to continue using my inelegant workaround?
2. Right now I have sorted my table alphabetically by ‘title’, which works alright for the most part. My issue is that I would rather sort my list alphabetically by my custom taxonomy ‘rating’ (which doesn’t appear in the code above as I haven’t added it to my table yet, sorry!) and thereunder alphabetical by title. I can’t seem to find any examples of people doing something like this. Is it possible?

Thank you for your help in advance!