Part 5 got really messed up with the uber solders that are presented here.
First I've tried to deal with one of the prototypes by the knife, but, after many attempts, failed. It seems to get this achievement it's better to pick up the easiest difficulty and load the chapter separately to do it, also the prototype must be distracted by another enemy, electric kind in a best case scenario.
Second was the boss. No matter where you stand, he can kill the hero in about a second or two, due to electronic weapon he has, on top that health bar going really low here.
So took 50 attempts and some save / load sequence to proceed with it. At the end point decide not to cut it and left it how it is.
For those, who completed the game numerous times that, perhaps, isn't a big deal, but as for the my opinion, this is rather quite of example of not the best game design feature, in compare to some other titles from the same / similar time frame.
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