Originally, 'spurs' were awarded to knights. Think of 'earn your spurs' as achieving an honor.

Metaphorical Origin

It's used to describe achievements that are figurative, not actual 'spurs'.

Figurative Achievement

Often refers to reaching a significant point or recognition in one's career.

Refers specifically to developing abilities and becoming skilled in a field.

Implies gaining experience under tough or challenging circumstances.

Earning your spurs can also mean gaining respect and trust in your ability.