Mass Effect: Terminus
Milestones represent crucial decision points in a character’s life, or during a specific Mission. At the beginning of a Mission, a character may select one or two Milestones to pursue.
Reaching a Milestones earns the character 1, 3, or 10 experience.
1xp Milestones can be triggered as many times in a scene as events dictate.
If a quarian engineer has the Milestone “Quarian Saboteur”, the 1xp milestone might be “…when you hack a synthetic using the Hacking power.”
3xp Milestones can be triggered no more than once per scene.
“3xp when you use technical sabotage to avoid a violent confrontation”
10xp Milestones can be triggered once per Act. Once triggered, the Milestone is closed, and you may choose a new one. You can choose the same Milestone again if it continues to be applicable.
“10xp when you either destroy a hostile AI/dangerous technology or preserve such a thing at the risk of Exile from the Fleet.”