The phrase "a single accomplishment" is correct and usable in written English.
You can use it when referring to one specific achievement or success in a particular context.
Example: "Winning the championship was a single accomplishment that defined her career."
Alternatives: "one achievement" or "a solitary success."
I have yet to find a Rubio supporter who can cite a single accomplishment as senator or as speaker of the Florida House.
Clinton will need a stronger answer for these kinds of questions than she had for ABC New's Diane Sawyer last year when she did not cite a single accomplishment during her term at State.
And when a guy who built an entire city from scratch tells you that nobody in this life is important, you start to fear that nothing, not a single accomplishment that you rack up, will ever mean anything to anybody, ever.
It's an astonishing accomplishment for a Symphony Orchestra to attract crowds like a rock concert, but as you learn more about music in Cincinnati, and about the way the city supports its music, you begin to realize that it's more than just a single accomplishment.
"The greatest single accomplishment has been a kind of political maturity, an ability to deal with political elites, heads of state, industrial elites.
Only the current President Bush goes without receiving credit for a single significant accomplishment.
During the two-hour interviews, the managers talked about all aspects of a single significant accomplishment, from the glimmering of an idea to the results.
A refugee banker from Hungary with a fancy pedigree but little cash, and a single New York accomplishment: he was a founder — along with a bulky, Buffalo-born leprechaun of a puppeteer and art fanatic named John Bernard Myers — of a children's marionette theater.
He notes that he and the former first lady like to "kid around" when they see each other and that he did a memorably tough interview with an Obama surrogate, State Senator Kirk Watson of Texas, who failed — despite Matthews's grilling — to identify a single legislative accomplishment by Obama.
But Mr. Bush's argument that Anbar is a locus of progress has drawn fire from Democrats and critics of his war strategy, who say that he is picking out a single tactical accomplishment and ignoring broader strategic failures that have been documented by the intelligence community, the Government Accountability Office and an independent commission examining the Iraqi military and police.
"But after its defeat, Senator Shaheen doesn't have a single legislative accomplishment to run on as she seeks re-election.
