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Class the "conditions" are inheriting from:
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public abstract class Conditions : ScriptableObject
{
    public abstract bool ConditionAchieved(StateController controller);
}
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Example for a "condition" type class:
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public class C_CompareValue : Conditions
{
    // what value (resource, for example) belonging to a faction am I trying to compare
    public enum value
    {
        gold,
        testvalue
    }

    [InspectorName("Value")] public value valE;


    // what operation am I trying to test
    public enum operation
    {
        isBiggerThan,
        isSmallerThan,
        EqualsTo,
    }

    [InspectorName("Operator")]  public operation opeE;


    // what value am I comparing to
    [SerializeField] public float valueToCompareTo;


    // called every update by the state controller
    public override bool ConditionAchieved(StateController controller)
    {
        float valueToCompare = 0;

        switch(valE)
        {
            case value.gold:
                valueToCompare = controller.factionModule.gold;
                break;
        }

        switch (opeE)
        {
            case operation.EqualsTo:
                return (valueToCompare == valueToCompareTo);

            case operation.isBiggerThan:
                return (valueToCompare > valueToCompareTo);

            case operation.isSmallerThan:
                return (valueToCompare < valueToCompareTo);
        }

        Debug.Log($"Condition CompareValue for {controller} has failed.");
        return true;
    }
}
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