If I'm at 6 points and I conquer a battlefield with a unit whose equipped with Trinity Force and Skyfall of Areion, do I win?

Yes, you win.

Here's how it plays out:

1. Conquer action — You gain 1 point (6 → 7 points) from the standard conquer game action. Since you're at 6, the "one from winning" replacement rule doesn't apply yet.
2. Trinity Force triggers — Skyfall of Areion makes Trinity Force's "When I hold, score 1 point" also count as a conquer effect, so it triggers off this conquer. That trigger goes on the Chain.
3. Chain resolves — Once the trigger resolves, you gain the 8th point (7 → 8) and win immediately.

The key rule: the restriction that requires you to score every battlefield to reach the final point from a conquer (Rule 466.1.b.2) only applies to the point gained directly from the conquer action itself. Points from triggered abilities like Trinity Force bypass that restriction entirely (FAQ 7390, 8819, 10436).