All you need to pass the challenges is to press 'A'
AC
GodMode : this will make the character immune to all damage.
OHKGM (one hite Kills & god mode) : this will make the enemy died from the first hit with god mode activated to you .
OneHitKills : this will make the enemy died from the first hit .
few (freeze enemies weapons ) : This code will make enemies weapons (rifles,shotgun..) unuseable except you , so do whatever you want with them ;).
peace : This code will make both enemies and allies players weapons (rifles,shotgun..) unuseable except grenade and knife .
Note
some of this feature will effect/activated only for you or your whole team or the whole game players its all dependent in stack frame pointer value, you can always modify it with your needs .