The Satisfactory game has milestones that allow players to unlock new technologies and resources and could be considered momentous for new players. There is unlocking new stuff through the HUB, and through the Space Elevator. The Space Elevator especially has a grand animation that players would want to remember seeing the moments when they got to a new phase of the game. A simple way for this to work is to mark 30 seconds before the player hits the button to unlock a HUB upgrade, or sends a shipment through the space elevator.