NoSt109,608 Locked 29 Oct 2020 03 Dec 2021
This achievement is actually pretty easy to get.
Just get killed by a regular uruk (not a captain), find him and brand him. Then send him on an Initiation mission to become a bodyguard of one of the warchiefs.
Then you have two options:
1) If the warchief you've chosen is not branded, make your uruk betray him in order to become a warchief himself.
2) If the warchief you've chosen is branded, just summon him and then kill him. Your uruk will be promoted to warchief.
When your uruk got promoted to warchief, simply kill him.