Have a -50 relation with a lord, village, or faction.
The fastest way to get this achievement is to simply burn down a random village or join one of the kingdoms which is in a war with another kingdom.
Example:
I start my own game, and i took the travel that linked me to Jekala, which from there i just pillaged and stole cattle from the Orange Team till they hated me and then i went on to loot and burn their little villages!
Hope this helps!