Avenging a grudge is not just the act of defeating an enemy, it requires utterly humiliating them on the battlefield.
Source: Warhammer: The Old World Online Rules Index
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After deployment but before the first turn begins, nominate a single enemy character. For one reason or another, this individual has earned themselves a place in the Clan's Book of Grudges and must be brought to justice. All friendly models gain the Hatred (nominated enemy character) special rule. In addition, you win a bonus of 75 Victory Points if the nominated character is slain, has fled the battlefield or is fleeing when the game ends.