This has been fixed as of October 10, 2017.
To obtain this achievement you will need to use the Chicken Voodoo doll obtained from the Chult treasure boxes which are dug up using the map rewards from the weekly patrol quests.
1 doll needs to be used on each minion type.
These are the minions I personally found and did this on -
Trained Compy that was with the Batiri
Yuan Ti Swordsman
Also, in addition, Shadow 00 Fox states that "Worth clarifying, any Compy works, several different types of Batiri, Yuan Ti Swordsman and Archers, and Skeletal Archers, shamblers, and possibly a few others for that one."