Find 20 clues in the world.

Kill Walker.

Kill a target from 70m or more with the bow.

Take out 3 Insurgent Leaders

Complete the optional dialog in Erewhon about your past.

Kill 20 enemies by running them over.

Get 3 headshots with a handgun in 5 seconds.

Kill 2 enemies more than 200m away with headshots in 3 seconds.

Kill an helicopter's pilot with any weapon.

Reach the end of Act 2.

Cleared Chapter 2.

Read 30 books, journals or other documents.