In this example, your ACF field is named ‘associated_image’ and ‘chosen-image-size’ is the desired image size that is set within your theme.
// Get particular category's object info. $queried_object = get_queried_object(); // (Optional depending on desired outcome) If you wanted to get the type of taxonomy. $taxonomy = $queried_object->taxonomy; // (Optional depending on desired outcome) If you wanted to get the associated ID. $term_id = $queried_object->term_id; // Get image ID for this field. $attachment_id = get_field( 'associated_image', $queried_object ); // URL of image at specific size. $image = $attachment_id['sizes']['chosen-image-size'];