You have a character with a goal, he reaches his goal, the end. Right?
A bit boring maybe. Okay, you have a character, he has a goal, he faces obstacles, he overcomes them, the end. Better?
It depends, I suppose. If the obstacles and the way he overcomes them are interesting then that would be fine. It's all a bit mechanical though. Shouldn't there be a more emotional aspect to a story?
You have a character, a vampire kills his wife, he hunts down the vampire and finds an army of them. He sacrifices himself to stop them. The end.
The problem is what I'm suggesting is a variation on a simplistic theme. A person has a goal, when they either achieve it or fail to achieve it, the story ends and obviously that is how most stories work. But when you get to the end of a story you want some kind of moment. A feeling of satisfaction. Everything has been building to a point and now that you’ve arrived you want it to have some kind of meaning. And the way for that to happen is for the character to not just achieve (or not achieve) his mission, but for him to gain some understanding from it. You want him to have an epiphany.