Click on scores and stats, statistics, pilot. Enter your game ID, pick arena and tour click get stats. The second table has numbers for each aircraft you have killed with,killed, been killed by and died in. If you click on those numbers you will see who killed what.
As for the text buffer I had never paid much attention to how far back you could scroll so I just scrolled back more than 120 lines and that was the beginning of when I logged on so it goes at least that far back. When I say scroll I don’t mean expanding the buffer window I mean scrolling with the arrows, so that previous lines that are not visible move downwards into view.
Good luck.