displaying posts from a custom post type tags

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You’re looking for WP_Query

echo '<ul>';

//The Arguments
$args = array(
    'post_type' => 'project',
    'tagportfolio' => 'urban-design-and-landscape' //should use the slug name not the full name
);

// The Query
$the_query = new WP_Query( $args );


// The Loop
while ( $the_query->have_posts() ) : $the_query->the_post();
    echo '<li>';
    the_title();
    echo '</li>';
endwhile;

echo '</ul>';