Halo Wars 2

During Multiplayer and Skirmish matches, Leader Points are awarded gradually over time by building and upgrading your bases, capturing Power Nodes, and destroying enemy Units. These Points are represented by a small white circle icon on the top-right of your mini-map.

In order to use a Leader Point, you'll first need to bring up the Leader Power menu by tapping . Here, you can use your Points to either buy/unlock or upgrade several different Powers such as Restoration Drones, Orbital Strikes, ODST Drops, Glassing Beams, and more.

All in all, this achievement will come naturally over the course of your online career, so don't worry about rushing to get this done.