Since you do not indicate who "your" represents I will tell you about some successful retailers in the USA. Sears and Wal Mart. In the latter part of the 1800s and all the way through the 1900s Sears Roebuck ruled the retail world because they were smart to use the catalog method to reach the rural areas and lure the city people to buy and come into their stores. Later, they added automotive repair and tire and battery sales. They dominated the catalog sales world and big department stores for a long time. In the 1990s they had to quit the catalog sales and scale down their stores. Now we have Wal Mart started by Sam Walton. He started out building Wal Marts in the rural area. After he died his relatives put Wal Marts all over the USA and it is now the largest retail chain store in the USA and the richest.
His temple
Her greatest achievement was saving john smith and making her live better
He considered his lifelong greatest achievement (when asked at around 86 years of age), lifelong celibacy.
the spread of Greek culture.
To become the 1st Aboriginal politician.
The greatest achievement of the Inca empire was the building of Macchu Picchu.
As a retail store manager, your achievement would be to make the retail store a success. Other achievements may include increased sales and good employees.
Bobby Orr's greatest achievement ever was that he was a defenseman with an offensive mind.
The greatest achievement of any gay person is to live a happy, healthy life.
The greatest achievement of the Han Dynasty was the seismograph and the art of making paper.
His temple
your birth
electricity
Her greatest achievement was saving john smith and making her live better
He considered his lifelong greatest achievement (when asked at around 86 years of age), lifelong celibacy.
I think that the greatest achievement was art, science and technology.
The answer to this depends greatly on how one measures achievement. Some might consider his self-enlightenment to be his greatest achievement. Others might see his gathering of vast numbers of followers as his greatest achievement. Still others might consider his benevolent rule as the king of his clan to be his greatest achievement. The only way to answer this is to study the life of the Buddha for yourself.