Try this...

<?php
function list_post(){

    //or you can use the cat id here, check the codex for WP_Query
    $q = new WP_Query(array(\'category_name\' => \'<cat slug here>\'));
    if($q->have_posts()):
        while($q->have_posts()):the_post();
            the_title();
        endwhile;
    else:
        echo "No posts found!";
    endif;
    wp_reset_postdata();
}

add_shortcode(\'list_post\', \'list_post\');
?>