The phrase "ambitious achievement" is correct and usable in written English.
It can be used to describe a goal or accomplishment that requires significant effort, determination, or skill to attain.
Example: "Completing a marathon is an ambitious achievement that many aspire to but few accomplish."
Alternatives: "challenging accomplishment" or "aspirational success".
Absorbing and compressing the complex, sometimes cruel moral reversals and consequences of Carlo Collodi's novel into a slightly warmer, more streamlined fable, it still stands among the company's most ambitious achievements; if all you remember of it are a few treacly bars of When You Wish Upon a Star, it's time for another look.
The President had inspired the country to journey into a new era that leveraged modern technologies and changed the course of history, resulting in one of humanity's most ambitious achievements.
Yet it's hard to see how this building is a markedly more ambitious contextual achievement than, say, the practice's Jubilee Primary School in a deprived Lambeth neighbourhood.
In response to EEO legislation and case law, personnel managers devised and diffused employment practices that treat all classes of workers as ambitious and achievement oriented in the process of formalizing and rationalizing promotion decisions.
But the nature of musicals is such that high-caliber performances of sung material can be achieved much more quickly than satisfying stagings, and as the productions have grown more ambitious, the achievement has sometimes felt shallower.
After all, the aims of the programme were nothing if not ambitious: "the achievement in international affairs of a regime more civilized, rational and humane than the empty system of power of the past".
Hodgson asks key questions: If Kennedy had lived, would he have matched Johnson's ambitious Great Society achievements?
In Ms. Bumiller's rendering Ms. Rice is neither hero nor villain but an ambitious woman whose achievements and shortcomings speak for themselves.
In 1584 Louis de Foix, an engineer and architect, undertook the construction of a new light, which was one of the most ambitious and magnificent achievements of its day.
