All Fired Up(Slinger)

Achievement Unlocked: All Fired Up

You’ve achieved a Strength score of fifty or higher! The  weak  nerd you once were is totally gone. Now you’re just a regular nerd.
 * Your muscle mass will now minimally (if at all) increase as a result of Strength
 * You have learned “Supreme Lifting”

Reference
Unlocked in Chapter 63 "The Lost Highway"