Activate the following cheats by starting the game with the corresponding command line parameters. For example, change your shortcut target to: "<drive and folder path>\forces.exe" -allmissions

CHEAT FUNCTION - COMMAND LINE PARAMETER
Mission select - -allmissions
Enable in game cheats - -cheatkeys
Unknown - -notfullscreen
Unknown - -demomode
Unknown - -noembm
Unknown - -nops
Unknown - -safevs
Unknown - -defaultmem
Unknown - -nopuretnl
Unknown - -nohwtnl
Unknown - -noframescaleup
Unknown - -noframewait
Unknown - -do5p1
Unknown - -nosplash
Unknown - -skipintro
Unknown - -screensize
Unknown - -screenmode
Unknown - -phase_text_used
Unknown - -quickbreak
Unknown - -debug
Unknown - -extras
Unknown - -cheatkeys
Unknown - -antia
Unknown - -multi2
Unknown - -multi4
Unknown - -edit
Unknown - -particles
Unknown - -noparticles
Unknown - -limittexture
Unknown - -localonly
Unknown - -lodhud
Unknown - -verbosehud
Unknown - -nodamage
Unknown - -singlestage
Unknown - -nolensflare
Unknown - -nosky
Unknown - -framerate
Unknown - -fileout
Unknown - -keys
Unknown - -mouse
Unknown - -movie
Unknown - -resetoptions
Unknown - -no3dsound
Unknown - -nosound
Unknown - -alias
Unknown - -latetextureload
Unknown - -nodither
Unknown - -nomipmap
Unknown - -nobilinear
Unknown - -notrilinear
Unknown - -nofog
Unknown - -nolighting
Unknown - -lowdef
Unknown - -noshadows
Unknown - -nocd
Unknown - -showloadingfilenames
Unknown - -renewfile
Unknown - -globalfile
Unknown - -notauto
Unknown - -no3dx
Unknown - -nokni
Unknown - -nowni
Unknown - -notsc
Unknown - -primary
Unknown - -secondary
Unknown - -compat
Unknown - -storepad
Unknown - -storeanims
Unknown - -nolod
Unknown - -autotgaconvert
Unknown - -forcetgaload
Unknown - -getfileinfo
Unknown - -loadsfxeditcaps
Unknown - -lowlod
Unknown - -copylist
Unknown - -filecopy
Unknown - -fileextend
Unknown - -view
Unknown - -sensaura_demo
Unknown - -sfxocclusion
Unknown - -sfxcockpit
Unknown - -sfxspecial
Unknown - -sfxphantom
Unknown - -sfxconic
Unknown - -sfxnofrontend
Unknown - -allmissions
Unknown - -english
Unknown - -french
Unknown - -german
Unknown - -spanish
Unknown - -italian
Unknown - -dutch
Unknown - -swedish
Unknown - -portuguese
Unknown - -host
Unknown - -join
Unknown - -notimeout

Enable the -cheatkeys code, then activate the following cheats by pressing the corresponding keys:

CHEAT FUNCTION - KEY
Toggle invincibility - F3
Toggle one hit kills - F4