The phrase "achievement for which" is correct and usable in written English.
It can be used when referring to a specific accomplishment or success that is being discussed or highlighted.
Example: "The award was given for the achievement for which she had worked tirelessly over the past year."
Alternatives: "accomplishment for which" or "success for which".
This is the achievement for which all three are best known.
It's an unprecedented achievement for which he doesn't receive nearly enough credit.
But equality of opportunity is not a natural state; it is a social achievement, for which government shares some responsibility.
Amid the rancors of that era Hendrix, like President Obama, was viewed as a figure who transcended race an achievement for which he was both admired and reviled.
She felt as if she had finally moved beyond the dramas of her childhood, an achievement for which she credited her new psychiatrist.
But by far his most positive achievement, for which he deserves huge credit, was institutional – the creation of the Office for Budget Responsibility.
These were statesman-like achievements, for which she should be congratulated.
This authoritative work and the Second Bibliography, 2 vol. (1929), are the achievements for which he is most noted.
In a lengthy interview, Mr. Walcott struggled to name any achievements for which he had been the driving force, finally citing the creation of an early-literacy program for children in public housing and a mayoral Office of Adult Education.
Mr Fox, a former head of Coca-Cola's Mexican operations, pledged further economic liberalisation and reform.Mr Fox's government can look back on a number of achievements for which his many domestic critics give him insufficient credit.
In this way, he managed to fundamentally reform the tax code and shore up Social Security during his first year in office — achievements for which he gladly took credit, even if Congress didn't give him precisely what he wanted.
