Can I score my last point by conquering 1 battleground with a unit that has both trinity force and skyfall of areion equipped?

Yes, you can win the game by conquering one battlefield with a unit equipped with both Trinity Force and Skyfall of Areion when you are at 7 points.

According to the official ruling in the FAQ:

• Ruling: A player can win the game using Trinity Force's triggered ability to gain the 8th point after conquering one battlefield. The requirement to score both battlefields in the same turn only applies to the point gained directly from conquering via game rules, not to points gained from triggered abilities.

How it works:

1. You conquer a battlefield while at 7 points.
2. Because you are one point from winning, the standard conquer point is replaced by drawing 2 cards (Rule 448.1.b.2).
3. Skyfall of Areion makes Trinity Force's "hold" effect also count as a "conquer" effect.
4. Trinity Force triggers off the conquer, granting you the 8th point and winning the game.

Because the point from Trinity Force is gained via a triggered ability rather than the standard "conquer" game action, it bypasses the restriction that requires you to have scored all battlefields in the same turn to reach the final point.