Usage patterns
〈人〉が快挙を成し遂げるfor someone to accomplish a brilliant feat
He accomplished the spectacular feat of flying around the world without landing.
快挙に沸くto be abuzz with excitement over a remarkable achievement
All of Japan was buzzing with excitement over the remarkable achievement.
〈数〉年ぶりの快挙the first feat of its kind in X years
This marked the first such feat in ten years.
世界初の快挙a world-first achievement
The team achieved a world-first feat.