You might have to play the upcoming The Last of Us Part 2 a few times to find out and unlock everything as more details about the upcoming game was revealed.
According to the game’s co-director Kurt Margenau, The Last of Us Part 2 will come with a different weapon and player upgrade system and that players will not be able to fully upgrade Ellie in the first playthrough of the game.
He explained that the new game will focus on the consequences of their choices and that will apply also to the skills that you choose to learn and focus on. This means players will make to think before they decide and live with it once the decision has been made even though the decision might not be the best later on in the game.
This will encourage players to play the game multiple times to experiment with the different skillset for Ellie. The Last of Us Part II will be arriving on the 19th of June on PS4.