Hello everyone. I'm writing a custom action to unlock achievements. I have a list of achievement names in a separate script, and I want a drop down menu of those names to select the achievement, which would set the id of the selected achievement to unlock.

I'm trying this (only the relevant parts):

protected int selectedAchievement;
public override void ShowGUI()
    {
        // Action-specific Inspector GUI code here
        List<string> namesList = new List<string>();

        foreach (string name in Achievements.names)
        {
            namesList.Add(name);
        }

        selectedAchievement = EditorGUILayout.Popup("Achievement name: ", selectedAchievement, namesList.ToArray()); 
    }

The dropdown menu correctly displays the achievement names and I can select one. But if I restart the Unity Editor, the selected achievement reverts back to the first one in the list. There's no reason for the int to be protected. I just copied that from another AC action script because it wasn't working. Am I missing something? Why wouldn't this be working? I'm using AC v1.74.2 and Unity 2022.3.39f1.