Wolfenstein II: The New Colossus
80 Achievements
60-80h
Sub Expert
Beat the Submerged challenge on 'I am Death Incarnate' difficulty
0.1%
How to unlock the Sub Expert achievement in Wolfenstein II: The New Colossus - Definitive Guide
Throw a hatchet at the armor-less soldier walking out of the room, then shoot the scientist checking out both dead guys by the room (sometimes he's there, sometimes he's on the other side of the room.)
This is a perfect clear at the start, but in the event that you get it (or don't, regardless), run straight to the room on the right where the armor-less guy was. If you are too slow after the alarm goes off, a heavy shotgun soldier will spawn so be careful.
After that, just crouch and camp in that room with your shotgun. Aim for the head when the supersoldaten come at you and you should be fine like I was. If you really are quick, you can grab a +100/+50 armor just outside the room in a corner too.
However, for whatever reason this isn't 100% viable. Sometimes they can shoot through the wall (at least it seems). Also, don't scope in or you'll automatically lean out and be instantly slaughtered. It took me roughly 20 minutes to hit it consistently.
Three total supersoldaten come around at you, so UNLOAD! Roughly 10-20 soldiers plus 2 ubersoldiers also come at you. However, don't spam the shotgun as you do have limited ammo. Be conservative and aim well. If for whatever reason you run out before the waves are up, switch to the rifle in semi-auto mode. A dog is also there, but swing a hatchet at the stupid thing :).
You will know it is over when dialogue pops in.
(Of course, this is for points. If you know where you're going, you can stealth kill a few at the start and simply run for it :D )
This challenge will unlock after "Volume 3: Final Mission" has been completed on any difficulty.
From the Main Menu, you can access challenges by opening the SAS Machine and then selecting "Combat Simulations." Now scroll over to the Freedom Chronicles tab and you will find all three challenges available. While hovering over a challenge map, tap three times to toggle the difficulty to "I am Death Incarnate!"
These challenges are areas from Captain Wilkins' Campaign where you'll be required to get from Point A to Point B while fighting Nazis along the way (with the exception of the third challenge map, which sees you surviving against a massive horde of Nazis inside a large room). Fortunately, you don't actually have to net the score required to get the "I am Death Incarnate!" medal for this achievement. Instead, all you really need to do is reach the end of the simulation.
Combat play style will vary from player to player, so there is no set strategy for each map. That said, feel free to refer to THIS GUIDE, courtesy of nekov4ego, as a means of completing these simulations efficiently.