$terms = get_terms( 'portfolio_category' );

$count = count( $terms );

$i = 0;

if ( $count > 0 ) { ?>
    <ul id="portfolio-cats" class="clearfix">
        <?php foreach ($terms as $term ) : ?>
            <li>
                <a href="#"><?php echo $term->name; ?></a>
            </li>
        <?php endforeach; ?>
    </ul><!-- /portfolio-cats -->
<?php }