Jump in the water at the start of the first level, go left and swim through the cave. Right before you come out of the water, the game will lock up - the music will continue playing, but the game has frozen and the only thing left to do is to reset the 360.
Settings used:
ROM: Turok - Dinosaur Hunter (USA).n64
Texture enhancement: None
CPU core: Dynarec
framerate limiter: On
Version: latest commit on repo