There are many difficult achievements in "Frost Age 2", and consistency is one of them. To achieve this achievement, you only need to complete one game, and during the whole process, you do not study anything that is related to your existing foundation. Contrary thoughts or the passage of any law.
How to achieve consistent achievement in Ice Age 2
Always the same
The requirement for achievement is to never study buildings or pass laws that contradict existing properties
Complete a playthrough without researching any ideas or passing any laws that are contrary to your existing cornerstones.
If you do this, civil war is almost inevitable, and it is impossible not to fight, because the opposing factions must be completely ignored, and the opposing factions will definitely rebel.