RuneScore is a points system used to measure completed achievements. It was added on 29 August 2017 and can be viewed by clicking the Hero icon in the game interface; it is located on the upper left tab. Most achievement has an assigned value (between 5 and 75) and upon completing the achievement its value is added to the player's RuneScore.
The maximum possible RuneScore is currently 20,390, coming from 1,832 achievements, as of 20 June 2018.
Some achievements that are heavily luck-dependent, such as skill pets, boss pets or boss collection log achievements, do not contribute to a player's RuneScore and have an assigned value of 0.