Dear Christian,
His victories are listed in Wikipedia, which is quite an obvious source,
https://en.wikipedia.org/wiki/Heinz_Hackler
There is also a French site which lists all the victories of JG 77 in 1943
http://www.cieldegloire.fr/jg_077d.php
Unfortunately, I don't have access to any detailed reports of his victories.
Yours sincerely,
Teresa