He did quite a bit:
Rudel flew 2,530 combat missions claiming a total of 2,000 targets destroyed; including 800 vehicles, 519 tanks, 150 artillery pieces, 70 landing craft, nine aircraft, four armored trains, several bridges, a destroyer, two cruisers, and the Soviet battleship Marat.
That’s more than entire division of tanks. 400 tanks to a division, generally.
Impressive. The tanks were likely Russian, I would imagine.
Hans-Ulrich Rudel
https://en.wikipedia.org/wiki/Hans-Ulrich_Rudel