The main story of Starfield centers around a collection of mysterious artifacts, the first of which players will find during the game's opening stages. As they begin to track down more of these strange antiquities, they'll learn how humanity came to master intergalactic space travel as well as what happened to planet Earth.
Starfield: Main Mission List (All Main Quests & Objectives)
The main story of Starfield is broken up into nineteen missions, each of which is made up of smaller, more manageable objectives.