If you guys are failing the hacking, I can only think it's because of some sort of sensitivity setting that you put your keyboard at.
You literally just have to bash your head into the keyboard to beat those things.
For those struggling with the killing floor, the method I used made it fairly easy(Still, it's not foolproof, as the random spawns can be atrocious at times.):
Run up to the first weapon crate, grab it, grab whatever medkits you see, head to the "bottom" of the screen(If you were to orient yourself behind your character.) where you see a little nook formed by boxes/walls. Plant your c4 outside of this nook, go grab the next ammo crate which is just around the corner, plant more c4. Go hide in the nook.
Now comes the tricky part. If just one guard comes at you, snap his neck, if two come at you, and there's more than 60 seconds left on the clock, rifle them both and heal up.
Anything sub 60 seconds should be dealt with by using c4 every 5 or so seconds.
Basically, if they are even nicked by the c4, it will cause them to pause and do nothing for a few seconds, which, with 10 bombs is all the time you need.
Chesshawk, neither quadratix or quadratixes is taken by the game, so it makes the qua start a little bit harder, as you have to end up getting three random suffixes.
The boar boss was pretty easy. Move down to the bottom of the screen, when the hoofbeats start, move to the top and then forward, he'll chuck a spear, drop your weapon, pickup spear, wait slightly behind weapon, throw spear at boar, pickup weapon, beat on him. Only takes like 5 passes.
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You're welcome !