The phrase "achieved it before" is correct and usable in written English.
You can use it when referring to a past accomplishment or success that has been previously attained.
Example: "I am confident in my abilities because I have achieved it before, and I know I can do it again."
Alternatives: "accomplished it previously" or "done it before."
But shall we learn more about what it hopes to achieve, and how it proposes to achieve it, before we greylist, boycott or hang its academics in effigy?
It seems to me to be poorly thought out – how are they going to achieve it before September?
So realistic an objective was it, in fact, that all the leading candidates in London's mayoral elections of 2008 pledged to achieve it before they left office.
Although the SNP will not be drawn on a target date for independence, there will be a push to achieve it before the symbolically important date of 2007, exactly 300 years after Scotland lost its independence.
The Israeli people once elected a prime minister, Yitzhak Rabin, who was willing to pursue a peace agreement that recognized the authentic aspirations of both peoples, and who went a long way toward achieving it before he was assassinated.
The Royal Opera's new Guillaume Tell, perceptively conducted by Antonio Pappano, with a top cast led by Gerald Finley, John Osborn and Malin Byström, has achieved it as never before – and mid-performance at that.
Only John Lowe had achieved it on television before, and nobody had ever managed it at the World Championship.
Even if the plan to electrify the U.S. auto fleet is achieved, it will be many years before our national use of 20 million barrels a day is meaningfully reduced.
No 20th-century artist, Hughes claims, "could successfully make eloquent and morally urgent art out of human disaster," so how could Goya achieve it two centuries before?
But what constitutes real growth and the pathway to achieve it has never before been more confused.
