When an interdimensional rupture unravels reality, an unlikely hero must channel her newfound powers to fight bizarre and bewildering dangers from the multiverse as the fate of the world hangs in the balance.

I think getting the IRS off her back is certainly one of the more mundane goals in this film. In cinematic terms, I guess this means to defeat Jamie Lee Curtis.

when the massive orbit of a interdimensional void is thrown out of alignement earth disappears into primarial darkness. It's up to Sam a alien protoege to use her special psyhic powers to save earth from entering alternate realties and distortions.

What is the lead character's actual goal?

Close the rift?
Defeat the being that opened the rift (If there was one)
Stop a specific monster from coming through the rift?

In other words, what does winning look like on the screen?