Track Star(Slinger)

Achievement Unlocked: Track Star

Raise your Agility to 25 or higher through stat points, achievements, or otherwise!
 * Raising Agility further will improve reflexes and eyesight more!
 * Raising Agility further will improve movement speed less due to the physical limitations of the human body (and general physics)!
 * (Some) Agility Perks Unlocked

Reference
Inlocked in Chapter 24 "Loot Galore"