hi hope your having an amazing day 
copy the ULUS10041S0:
open your ppsspp foler
open memstick
psp
and lastly paste it in save data
all staunton missions complete not one mission on portland island complete
note that this only works on the psp version and ppsspp emulator
if this helped you please subscribe to my youtube channel 
iammiguel (it has a tennpenny picture)