great achievement; great feat; great work
Refers to a remarkable accomplishment, often in fields like science, sports, or history. Carries a formal, respectful tone.
His Nobel Prize win is a great achievement in the scientific world.
The construction of this bridge was a great feat at the time.
He accomplished a great feat that became the world's first of its kind.
This athlete established an unprecedented great feat.
The scientist left behind an achievement that remains in human history.
業績 refers broadly to one's accumulated work or output (e.g. in research or business), while 偉業 singles out one truly great, standout feat.
遺業 (same reading いぎょう) means the unfinished work or legacy left behind by someone who has died, whereas 偉業 means a great accomplishment itself, with no implication of death.
Compound of 偉 (great, admirable) and 業 (work, deed). The kanji combination directly conveys 'great work'.
She became the first woman to achieve an unprecedented feat.