Akuji's prototype bike              - Ronin mission 11.
Bandit                              - Multiple driving stunts.
Donnie's vehicle                    - Brotherhood mission 2.
Gang customization cars             - 15% hoods conquered.
Gang customization cars (more)      - 45% hoods conquered.
Gang customization cars (even more) - 65% hoods conquered.
Medical helicopter                  - Ronin mission 7.
News helicopter                     - Sons Of Samedi Mission 3.
Ronin vehicles                      - Ronin mission 11.
Saints ambulance                    - Complete all Ambulance missions.
Saints fire truck                   - Complete all Firefighter missions.
Sons of Samedi vehicles             - Sons of Samedi Mission 11.
Tornado Attack Helicopter           - Complete the final mission of the Ultor epilogue.