Call of Duty: WWII

In order to get this achievement you must shoot Dr. Straub which resides out of the map. When I got this, he was outside of the window in the Morge next to the Bar on the wall. I can confirm that he spawns in different spots at random, but if you'd like to get this achievement with as little research as possible you can just keep getting to the window I used until he appears there. To get to the window I pointed out earlier in the game, you must turn all 3 valves outside. There is one behind the first shield machine, one all the way to the left of the big round door behind the corner and one behind the riverside door (straight ahead after opening). You must next push the button next to the big hole in the ground next to the big round door (be careful a swarm spawns) and jump down into it. Once down there find the generator and turn it on and head back outside. Once outside open the big round door. Once in the room with the mystery box, head to the door on the side of the room opposite of the mystery box and open it. You will find the window down there next to the Bar on the wall.

NOT MY VIDEO...but I thought this would help, give a thumbs up if it did!

I've watched videos on YouTube and have read/watched the solutions on here. It seems that nobody really knows when he appears but I will say from my personal experience, I unlocked this on round 9. This might be coincidental but I will go into details with my experience. I tried this on solo play and was unsuccessful as I never spotted the doctor and I went as far as close to round 20 so I decided to try on Xbox Live Custom Games (I won't confirm if this only works on Xbox Live because I'm not totally sure but since it's an easter egg, I decided to try). I never spotted him on any of the rounds between round 1-8 but at the very beginning of round 9, the doctor spoke so I had a feeling that I was going to find him. I saved 3 zombies on the round and found the doctor in the morgue. He was behind the window in the operating room. I shot him with the Type 100 while being fully loaded and the achievement unlocked while I was reloading. Now I'm not sure if him talking in the beginning of the round was an indication that he was going to be doing his rounds, but like I said, that's the round that I was able to find him. I didn't listen to his message because my volume was low. Enclosed in the video below is all the possible locations where you can find him. It's not my video by the way but it helped me to find him whereas other videos didn't show as many locations and this video gave me the idea to check the operating room.

hey guys ... i made you guys a video guide for this annoying achievement , it shows you the few locations i used to try and find him (yes i know there are many many more but these are the most common ones) there is no certain way of making him spawn in and it is a luck based achievement but if you look in certain places it will be easier .... it may take a few attempts but it will work