To unlock the King of the Skill trophy in The Division 2, you will need to unlock and use all of the game's eight main skills. The additional sub-skills are not required for this trophy.
You can unlock new skills using Skill Points, which are awarded to you after missions and by taking part in open-world events. The first skill for each main category only costs one Skill Point. You can purchase new skills from the Quartermaster at the White House.
You will need to use each of the following:
- Chem Launcher
- Seeker Mine
The full list of Skills in The Division 2 can be found below: