The phrase "a milestone for a" is correct and usable in written English.
It can be used to indicate a significant achievement or event related to a specific subject or context.
Example: "The launch of the new product was a milestone for a company that has been struggling to innovate."
Alternatives: "a significant achievement for a" or "a landmark event for a".
The vice president of finance is our host on the day it announces a big re-financing to the markets—a milestone for a company that has had its fair share of difficulties.
Still, local residents said it was a milestone for a vital source of food and employment in the region.
The episode won him a jab from Jay Leno, a milestone for a little known Congressional candidate.
But it is still a milestone for a general-interest magazine that publishes only on the Web.
The unlimited-ride MetroCard turned 10 this month, a milestone for a thin piece of plastic that has helped usher in a boom in mass transit ridership.
Elsewhere, Ehsan Haddadi won a discus silver, Iran's first medal ever in athletics, a milestone for a country that was previously only dominant in wrestling, weightlifting and taekwondo.
However, the figures also showed what the DfE called a milestone for A-levels, with more than half of all subjects entered being in the "facilitating subjects" preferred by universities.
Good Sam recently signed up its millionth member--a milestone for a group that has served as an advocate for RV owners on local, state and national issues.
WASHINGTON — For the first time in over three decades, the Nuclear Regulatory Commission is expected to decide to grant a license to build a nuclear reactor — a milestone for an industry whose long-hoped-for renaissance is smaller and later than anticipated.
The formal approval is the ministerial rubber-stamping of earlier checks by government bodies including the Environment Agency and the Health and Safety Executive, but marks a milestone for an industry that has been plagued by delays.
Launching an independent research career is a milestone for any young researcher.
