Earning this Achievement/Trophy will come natural as you play the game.
The same goes for
EDIT: As you can see on the screenshot, these chaos points related trophies do not pop when you reach the said sum of chaos points. Instead at some random point later in the game. [url]
https://pbs.twimg.com/media/CXohSUIWYAA4BPZ.jpg:large[/url]
This trophy popped randomly after I liberated a military base with ~135k Chaos
And, as always: Before you downvote this solution, please write down a comment first and tell me what might be the problem. Random downvotes are uncool. Thx.