What four fears has Tris faced at this point?

From the text:

In the past four days, I faced four fears. In one I was tied to a stake and Peter set a fire beneath my feet. In another I was drowning again, this time in the middle of an ocean as the water raged around me. In the third, I watched as my family slowly bled to death. And in the fourth, I was held at gunpoint and forced to shoot them. I know what fear is now.