I'll list several -- the first number will be the current record, the second will be where Hack stands currently.
Career yards: 7,212 - 3,409
Career attempts: 1,082 - 439
Career completions: 606 - 263
Career TD Passes: 43 - 21
The following are single season records with the second number being how Hack did as a true freshman.
Yards Passing: 3,266 - 2,955
Attempts: 446 - 392
Completions: 270 - 231
TD Passes: 24 - 20
At a glance, these are records Hack already owns:
Single game passing yards - 454
Single game passing yards by a sophomore - 454
Single game passing yards by a freshman - 339
Season passing yards by a freshman - 2,955
Pass attempts in a game - 55
I'm guessing he set a bunch of others (TD's in a season by a freshman, TD's in a game by a freshman), but I haven't found a very good source for all that info.