Can Draven Audacious get you to 8 points?

Yes, Draven, Audacious can get you to 8 points to win the game.

According to Rule 448.1.a.1, points earned from sources that are not "Conquer" or "Hold" actions are not subject to the final point restrictions (which require you to have scored on all battlefields that turn). Because Draven's ability is a triggered ability that grants a point upon winning a combat, it is not beholden to those restrictions and can be used to reach your 8th point.