From the ego menu, go to goals and a list of all of the various pursuits will be there. Many of the pursuits available take quite a bit of progression and overall play time. The quickest way to earn pursuits is to simply play the story missions and complete all side missions as they appear. All 6 Mount Tam pursuits should be your main priority and should take between 2-3 hours to complete. You can look at DefianceData.com for recording locations for the 5th Mount Tam pursuit if you are having trouble finding them. Other easy pursuits include the first in Combat, Ego Evolution, Ego Class, and Arkfalls: Living to Kill, Ego Evolution, (selected class) I, and Ark Hunting as a Way of Life respectively.