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Load Stalingrad. After you complete the objective of "Make it home", you keep going forward and a German soldier yells, "Get back inside!" or something like that, follow his demand on where to go and very shortly you'll enter a crawlspace. Then, you'll be able to pick up a knife behind an enemy soldier which immediately saves as a checkpoint I believe. I killed him before attempting what I'm about to state. Killed him, then reloaded my last checkpoint (which is when I pick up the knife), then quickly crouched into that last crawlspace for a few steps, then immediately upon exiting the crawlspace went for the kill on said soldier. Reloaded and kept doing the same and my achievement tracker increased upon each kill.
Happy Nazi killing everyone. :)