For X-Country, she has the following Milestones:
Milestone 1: Maternal Instincts
1 XP: when you show being around kids makes you uncomfortable
3 XP: when you protect a younger member of your team whether they want it or not
10 XP: when you take direct action to keep Nightingale in your life or sacrifice yourself to save her life
Milestone 2: Identity Crisis
1 XP when you first take mental or emotional stress.
3 XP when you either ask to join a new team or turn down an offer to join one.
10 XP when you either abandon your heroic identity to return to civilian life or when
you leave your current occupation to be a full-time hero.