I was able to answer my question thanks to : https://wpquestions.com/Remove_duplicates_from_ACF_query/12685
<?php
$posts = get_posts(array(
'numberposts' => -1,
'post_type' => 'page',
'orderby' => 'meta_value',
'order' => 'ASC',
));
if($posts)
{ /* FIRST, get all the post data */
foreach($posts as $post)
{ /* SECOND, one-by-one, add each data row for the specific field into an array */
$io_names[] = get_field('io_name');
} /* THIRD, run through the array and remove all duplicates */
$io_names = array_unique($io_names);
foreach($io_names as $io_name)
{ /* FINALLY, display the data on the page */
echo '<p><a href="#">' . $io_name . '</a></p>';
}
}
?>
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