【Feat】 , 【exploit】 , 【achievement】 denote a remarkable deed or performance.
【Feat】 applies particularly to an act involving physical strength, dexterity, and often courage; an 【exploit】 is an adventurous, heroic, or brilliant deed; 【achievement】 emphasizes the idea of distinguished endeavor especially in the face of difficulty or opposition; all are used frequently with some degree of irony.