For the Leaders, Destiny 2 drops galore, you will have to kill twenty fallen Captains. You can kill them by any means you want, so feel free to throw heavy weapons for this or a good sniper rifle.
The best place to go for this Bounty is Trostland on the EDZ. He has three lost sectors near the church which all contain a fallen captain as a leader. Make your way to the Atrium, Widow's Walk or Terminus East Lost Sector to find a Convenient Fallen Captain to kill.
There is an even faster way to do this, however, even if it can get a little boring and repetitive. From the church, head right along the side street and into the broken building that leads to Maevic Square.
In the center of the square you will find a fallen Captain, who is very easy to kill as he is not even a Major. You can quickly delete it, then go back the way you came until the location name Trostland appears on the screen.
Turn around and run back to Maevic Square, and the Fallen Captain has respawned and you can quickly take him out again. The procedure mentioned above is the quickest way to do this, but it can get a little tedious. If you want to break things, head to one of the Lost Sectors and kill a fallen captain there, before making your way back to Maevic Square.
You'll also need to get forty-five sniper rifle kills for this Bounty, so you can also take them out while running.
