Just edit /common_files/modules/Advanced_Customer_Reviews/acr_product_details.tpl
(Or much better copy the template into your own custom skin)
Look for this line (near line 53):
Code:
(<a href="reviews.php?productid={$productid}{if $cat}&cat={$cat}{/if}">{$general_rating.total} {$lng.lbl_acr_reviews}</a>)
change it to:
Code:
(<a href="#product-tabs-feedback">{$general_rating.total} {$lng.lbl_acr_reviews}</a>)