WoW 8.0 BFA Pathfinder is similar to 7.0 Pathfinder, they both focus on the Reputation, World quest, and Class campaign. But it is only the part one of Pathfinder, with the Patch upgrade, BFA Pathfinder will be totally unlocked.
BFA Pathfinder Part One includes the following Five parts:

1. Battle for Azeroth Explorer: It is easy to do when you level 110-120.
2. Zandalar Forever!/Kul Tourist: Complete Three Maps Main Questlines. If you have a complete plan of leveling, you will have the Three Maps quests done when get to level 120, and have the World Quests unlocked too. Or you will find that it is too hard to go back and do the quests again when you already be 120.
3. Wide World of Quests: Complete 100 different World Quests in Kul Tiras and Zandalar. World quest is the main method to unlock pathfinder, with the unlock progress of the Pathfinder, 100 world quests are done automatically.
4. Azerothian Diplomat: Earn Revered with all of the Kul Tiras or Zandalar reputations. Reputation is always the core part to unlock pathfinder. In BFA we have more choices to earn reputation point: buying contract of a faction from AH by wow gold to gain the corresponding reputation when completed world quest by using the contract. It also helps to unlock New Races and upgrade Azerite level.
5. Ready for War: It was divided into 8 steps. three maps for Alliance, three for Horde, To start the quest of the opposite faction, you have to open the Foothold and complete quests by the NPC guide. Meanwhile, at Revered standing with 7th Legion/The Honorbound, the final chapter unlocks. You will finish the achievement once earned a revered reputation. It also will help to unlock a mythic dungeon. The War Campaign completion is the necessary condition to unlock new Races.