<?php

// display current language
if ( defined( 'ICL_LANGUAGE_CODE' ) ) {
    echo "<pre>Current language code: ";
    print_r(ICL_LANGUAGE_CODE);
    echo "</pre>";
}

// get all WPML languages
$langs = icl_get_languages('skip_missing=0&orderby=KEY&order=DIR&link_empty_to=str');

// get acf option "seo_title" in all languages
foreach ($langs as $lang) {
    // modify current language
    add_filter('acf/settings/current_language', function() {
        global $lang;
        return $lang['code'];
    });

    echo "<pre>seo_title [{$lang['code']}]: ";
    print_r(get_field('seo_title', 'option'));
    echo "</pre>";
}

// reset to original language
add_filter('acf/settings/current_language', function() {
    return ICL_LANGUAGE_CODE;
});