How to create a loop in Functions without showing posts.

So I’m trying to create a simple list of posts from a certain category and I wanted to put that function in my functions.php so I could just call the short code.

I get the list I want however, I also get the full posts below the list… ? I dont want the posts.

(Also wondering how to get these posts in reverse Chronological order)…

Here is my function:

function getVolArchives() {
	query_posts('category_name=volunteerspotlights&showposts=12');
		echo '<ul style="list-style: none;">';
	while (have_posts()) : the_post();

		echo '<li style="width: 50%; float: left;"><a href="'. get_permalink() . '"><div style="font-size: 14px; font-weight: bold;">' . get_the_title() . '</div><div class="archiveName">' . get_the_date('F') . '</div></a></li>';
	endwhile;
		echo '</ul>';
}

add_shortcode('getVolArchives', 'getVolArchives');