ACF

<?php

/*
*  Loop through post objects (assuming this is a multi-select field) ( don't setup postdata )
*  Using this method, the $post object is never changed so all functions need a seccond parameter of the post ID in question.
*/

$post_objects = get_field('YOUR_CUSTOM_FIELD');

if( $post_objects ): ?>
    <ul>
    <?php foreach( $post_objects as $post_object): ?>
        <li>
            <a href="<?php echo get_permalink($post_object->ID); ?>"><?php echo get_the_title($post_object->ID); ?></a>
        </li>
    <?php endforeach; ?>
    </ul>
<?php endif;

?>