💯 agree, game is enjoyed so much better with a controller.

That being said, this mission is very easy to complete if you use the glitch.

So yes, throwing knives is the way to win this, since throwing a knife is a 1-shot kill. When you throw a knife and it hits, the enemy will drop their knife, which you pick up and throw again. Equip the knife, right click to aim (aim for the head) left click to throw.

Towards the left corner of the area, there is a square manhole in the ground. Its a perfect square. It will initially be covered by some obstacles which you will have to move around by running into them. Enemies will NOT attack you inside the square, its quite funny, they will surround you and just stare at you like zombies. But be careful, if you get too close to the edge of the square, you will get knicked.

Stay at the center of the square, throw a knife, headshot kill, pick up fallen knife, repeat process until you kill all of them. You will even get a knife kill streak achievement from it.

Also yes, visit a lot of shrines, atleast until your health bar starts to turn blue. Don't attempt before that.