Yes, it was a historic series as NZ is Test #1 (probably) for the first time since the rankings were started.
Apart from that:
KS Williamson’s 238 at Christchurch is the highest for NZ against Pakistan, surpassing the 204* by MS Sinclair also at Christchurch in 2000-01.
He also becomes the first to score 238 (or 238*) in a Test. There are a number of lower scores such as 140*, 180*, 181* and 229/229* which have never been made.
KA Jamieson’s 6-48 at Christchurch is not an innings record for NZ v Pakistan.
However, his match bowling figures of 11-117 in the same Test are indeed a record for NZ against Pakistan. The previous best was 11-152 by C Pringle at Faisalabad in 1990-91.
The previous best match figures for NZ in NZ were 9-70 by FJ Cameron at Auckland in 1964-65.
Also left behind is the neutral venue record for NZ by MD Craig of 10-203 at Sharjah in 2014-15.