Ones I know about
net_graphheight "100" //These values are what I use, you should play with them and see what works
net_graphpos "400"
net_graphproportionalfont "100"
net_graphshowinterp "1"
net_graphshowlatency "1"
net_graphsolid "1"
net_graphtext "1"
Edit: Should be more stuff here beginning with "net_"
https://developer.valvesoftware.com/wiki/List_of_TF2_console_commands_and_variables#N