Definitely. There will be three major branches.
- Go with the generals
- Join one of three factions on Sinathit, get popular and ask the faction leader where Mr. White is
- Ignore Mr. White completely and just live without ever meeting him
Second option will be achieveable without killing anything. You will learn a trade, join a faction, improve your trade skill and get popular with the faction residents and then talk to the faction leader, who knows where Mr. White is.
And that's only the first part of the main quest. Next part will be about deciding if you want to get rid of Mr. White, help him or just not get involved.
This is very rough simplification, since I don't want to spoil everything, but there will be multiple ways to finish the main story line and finishing the game without fighting anything at all will be possible.