TSS campaign is first so you can unlock everything then go through the original campaign

in GOG Galaxy\Games\SWAT 4\ContentExpansion\System

open

swatguistate.ini

delete everything in-between

bViewingGameSpy=False
and
MissionEquipment=Class'SwatEquipment.Stingray'

replace with

CompleteMissionList=SP-Arcade
CompleteMissionList=SP-HalfwayHouse
CompleteMissionList=SP-Backstage
CompleteMissionList=SP-Office
CompleteMissionList=SP-DrugLab
CompleteMissionList=SP-Subway
CompleteMissionList=SP-Warehouse
CompleteMissionList=SP-FoodWall
CompleteMissionList=SP-FairfaxResidence
CompleteMissionList=SP-ConvenienceStore
CompleteMissionList=SP-ABomb
CompleteMissionList=SP-AutoGarage
CompleteMissionList=SP-RedLibrary
CompleteMissionList=SP-Casino
CompleteMissionList=SP-JewelryHeist
CompleteMissionList=SP-Tenement
CompleteMissionList=SP-Hospital
CompleteMissionList=SP-ArmsDeal
CompleteMissionList=SP-Hotel
CompleteMissionList=SP-DNA
CompleteFriendlyNameList=-EXP- FunTime Amusements
CompleteFriendlyNameList=-EXP- Sisters of Mercy Hostel
CompleteFriendlyNameList=-EXP- Sellers Street Auditorium
CompleteFriendlyNameList=-EXP- Department of Agriculture
CompleteFriendlyNameList=-EXP- Drug Lab
CompleteFriendlyNameList=-EXP- Fresnal St. Station
CompleteFriendlyNameList=-EXP- Stetchkov Warehouse
CompleteFriendlyNameList=Food Wall Restaurant
CompleteFriendlyNameList=Fairfax Residence
CompleteFriendlyNameList=Qwik Fuel Convenience Store
CompleteFriendlyNameList=A-Bomb Nightclub
CompleteFriendlyNameList=Victory Imports Auto Center
CompleteFriendlyNameList=Red Library Offices
CompleteFriendlyNameList=Northside Vending and Amusements
CompleteFriendlyNameList=DuPlessis Wholesale Diamond Center
CompleteFriendlyNameList=Children of Taronne Tenement
CompleteFriendlyNameList=St. Michael's Medical Center
CompleteFriendlyNameList=The Wolcott Projects
CompleteFriendlyNameList=Old Granite Hotel
CompleteFriendlyNameList=Mt. Threshold Research Center
MissionName=SP-Arcade
MissionName=SP-HalfwayHouse
MissionName=SP-Backstage
MissionName=SP-Office
MissionName=SP-DrugLab
MissionName=SP-Subway
MissionName=SP-Warehouse
MissionName=SP-FoodWall
MissionName=SP-FairfaxResidence
MissionName=SP-ConvenienceStore
MissionName=SP-ABomb
MissionName=SP-AutoGarage
MissionName=SP-RedLibrary
MissionName=SP-Casino
MissionName=SP-JewelryHeist
MissionName=SP-Tenement
MissionName=SP-Hospital
MissionName=SP-ArmsDeal
MissionName=SP-Hotel
MissionName=SP-DNA
FriendlyName=FunTime Amusements
FriendlyName=Sisters of Mercy Hostel
FriendlyName=Sellers Street Auditorium
FriendlyName=Department of Agriculture
FriendlyName=Drug Lab
FriendlyName=Fresnal St. Station
FriendlyName=Stetchkov Warehouse
FriendlyName=Food Wall Restaurant
FriendlyName=Fairfax Residence
FriendlyName=Qwik Fuel Convenience Store
FriendlyName=A-Bomb Nightclub
FriendlyName=Victory Imports Auto Center
FriendlyName=Red Library Offices
FriendlyName=Northside Vending and Amusements
FriendlyName=DuPlessis Wholesale Diamond Center
FriendlyName=Children of Taronne Tenement
FriendlyName=St. Michael's Medical Center
FriendlyName=The Wolcott Projects
FriendlyName=Old Granite Hotel
FriendlyName=Mt. Threshold Research Center

save and exit

open

swatgame.int

replace

CompleteFriendlyNameList=

with

CompleteFriendlyNameList=("-EXP- FunTime Amusements","-EXP- Sisters of Mercy Hostel","-EXP- Sellers Street Auditorium","-EXP- Department of Agriculture","-EXP- Drug Lab","-EXP- Fresnal St. Station","-EXP- Stetchkov Warehouse","Food Wall Restaurant","Fairfax Residence","Qwik Fuel Convenience Store","A-Bomb Nightclub","Victory Imports Auto Center","Red Library Offices","Northside Vending and Amusements","DuPlessis Wholesale Diamond Center","Children of Taronne Tenement","St. Michael's Medical Center","The Wolcott Projects","Old Granite Hotel","Mt. Threshold Research Center")

and

FriendlyName=

with

FriendlyName=("FunTime Amusements","Sisters of Mercy Hostel","Sellers Street Auditorium","Department of Agriculture","Drug Lab","Fresnal St. Station","Stetchkov Warehouse","Food Wall Restaurant","Fairfax Residence","Qwik Fuel Convenience Store","A-Bomb Nightclub","Victory Imports Auto Center","Red Library Offices","Northside Vending and Amusements","DuPlessis Wholesale Diamond Center","Children of Taronne Tenement","St. Michael's Medical Center","The Wolcott Projects","Old Granite Hotel","Mt. Threshold Research Center")

save and exit