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');
?>