Instapasses in Grand Theft Auto: Vice Opportunities

Ultimate Betrayal + A Chink In The Armor = A Chink In The Armor*
* Very difficult to pull off. Dupe Ultimate Betrayal 5 times using any method, then start ACITA, as duped missions screw with the mission counter and unlocks ACITA temporarily. However, it is a 1/25 chance to work, as it often crashes. The No AJS speedrun route has an alternate method that has a different 1/25 chance that can be redone without crashes.

Bring Them Down x2 + Homecoming = Homecoming*
* This is actually the only possible checkpoint transfer. Start an om0 rampage then go to Bring Them Down and throw a grenade down while approaching Amaya. This will give you both om0 BTD and om0 rampage. Dupe BTD and let the rampage timer run out. Continue the mission as normal up to right after killing Siyang Ayanal. Start Homecoming to instapass/checkpoint transfer it.

Do A Barrel Roll --> Electrical Triathlon = Electrical Triathlon
==== Justice For Vice City + Katalina friend activity + Vigilante --> Sanchez vs. Streetwannabes + Leap And Bound --> Taxi Driver + Firefighter = Firefighter, Taxi Driver, All Raven Races except Electrical Triathlon ====