What was a vassal expected to do besides avoid injurious behavior?

Besides not having an injurious behaviour the vassal was also expected to be  good in advising such that advice would do good to others. By Advising good things to others a vassal was in a way helping God.

A good and faithful vassal would always be helpful, Practical, harmless, easy and Safe. There are almost six qualities that a good vassal follows. The connection was said to be of Faith between God and vassals.

explanation: we can only guess at how our actions may be perceived in the future. doing something really big like killing lots of people, saving lots of people, affecting the lives of lots of people is a sure fire way of being remembered in historical records. we can also make a difference in the history records by being a small influence on something bigger, whether that is as a civil servant, scientist or artist.

of course you could argue that we all affect history just as tiny cogs in a   bigger machine.

if you mean how do people influence our opinions of things which have already happened, then simply by writing a book which looks at things form a different perspective and trying to convince people that this perspective is more accurate or truthful. people do it all the time i.e. richard the third was a terrible or was he? plenty would disagree, it's just that their views aren't the most widely known.n: