It's the not killing AND not getting any alerts thing that really seems impossible.


>how did you deal with the ninja
>pmc dudes in the 4 story building in act 1 i think.

Mk. 22 silenced tranquilizer pistol and Mosin Nagant sniper rifle through most of it. I occasionally used smoke grenades with the grenade launcher to stun the frogs, then shot em with the tranqs. If anybody got too close, I used CQC.

I'll probably use the same technique for the rest of the game (unmanned vehicles like Gekkos and Strykers don't count as kills).

The shotgun with v-ring ammo is HIGHLY effective in boss fights. If you use non-lethal weapons for both rounds (not just when they take off their suits) you get a little bonus item.