In "Frost Age 2", the Chaos Signal achievement guide is worthy of players' in-depth exploration. Achieving this achievement is not easy and requires key points. That is, successfully facilitating simultaneous rallies and protests in cities. This is usually only possible in the story after Chapter 3, and achieving it will unlock the achievement.
Simultaneous rallies and protests in cities
Location: Story [possibly during or after Chapter 3] or Utopia Builders
Favoring one faction while ignoring the other. Overwatch/Bohemian is a good combination.
This may happen after Chapter 3 or later in the story.
By choosing one faction's approach to dealing with Frost, you'll anger the other faction, who will occasionally hold rallies and protests if the opposing faction can be equally outraged and satisfied.
Holding rallies and protests simultaneously will unlock this achievement and will likely happen on its own.
Mixed Signals
Have rallies and protests in the City at the same time
Location: Story [Likely during or after Chapter 3] or Utopia Builder
This will likely happen during Story after during or after Chapter 3.
By choosing one faction approach towards dealing with Frost you will anger the other one, if manage to equal anger and also satisfy opposing factions they will hold rallies and protest occasionally.
Having both rally and protest at the same time will unlock the achievement and will likely happen by itself.