Can Leon miss a kick? Never seen that happen.
I got 97% accuracy on one chapter (1-2 The Valley >> 1-3 Chief's House). It was difficult, took me alot of attempts. My goeal was 100%, but I eventually accepted "only" 97.
(I take more than just the accuracy in consideration, also health lost and if the overall luck with items is very bad or very good. As an example, a Ganado dropping 3300 pesetas may outwigh one missed shot.)
I don't know you yet, so I'll leave it to others to judge if you made it to chapter 3-4, lol.
Are you a RE4 fanatic? That kind of achievement is of course possible (if fanatic enough)...
Impressive if true.