Bat and Pork:
Complete all of the rescue-style missions. The Bat and Pork helicopters will be unlocked in all modes.

Final rescue mission and time attack mode:
Complete all of the chase-style missions. Time attack mode will now be unlocked. Select mission mode to access the "Final Rescue" mission.

Chase car mode:
Achieve an "A" rank on each mission and an "S" rank on the "Bus Chase".

Final rescue mode:
Achieve an "S" rank with the Sports Car.

Disaster mode:
Achieve an "S" rank in final rescue mode.