Throughout regular gameplay, you will likely remove a limb from one of the nazis you are fighting. I'm also pretty sure there's cutscenes involving amputation but I can't remember where.
There is a scene in which a nazi general has her head and jaw partially crushed, after which she monologues directly into the camera showing you that her teeth have been broken.
the game features a scene of a character of your choice dying via a lobotomy
it isn't shown until the end and if you would have trouble seeing that you can skip the cutscene
Our main protagonist is shown to have lived in a mental institution for 14 years and when the nazis show up to kidnap the inhabitants, there is a combat section.
One NPC conversation overhead during Chapter 9 involves a citizen filing a report of a "boy trying on his mother's lipstick", implying the boy and/or his family was executed for the behaviour.
Lots of soldiers in the beginning are trying to swim to the surface but get shot. The ones who don't die instantly most likely drowned (you don't see that though) and a bunch of bodies are floating underwater