How do you finish Mission 4? I killed them all, but where's the exit?
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You are likely to have missed a few sneaky ones.
1. You have to kill literally every zombie, therefore also the one behind the barricade straight ahead of the goal of you
Left of you is one in a metal container (there are 2-3 of those types)
there are a few clawing out of the sewer bars
Here is the most sneaky one.
Turn right from your starting picture of the video, over the barricade. Left and left and you can climb up a ladder.
Looking straight ahead there is a metal thing blocking the way and a dog behind which cant be accessed but you can shoot it.
-> Look in the distance on a rooftop in a corner slightly left. There is a zombie hiding in a corner <-
You can shoot it from here but you need enough ammo