The phrase "but rather achieved" is correct and usable in written English.
You can use this phrase when you want to emphasize that something was not done casually, but rather through determined effort. For example: "He did not become wealthy through luck, but rather achieved it through hard work and dedication."
Students don't receive grades but rather achieve levels of expertise, denoted on their report cards as "pre-novice," "novice," "apprentice," "senior" and "master".
Several of the set designers for these productions said that they did not aspire to reflect precise reality in their rendering of Manhattan and Brooklyn homes, but rather achieve exactly the sort of jealous stirring that New Yorkers can feel about the digs of their friends and neighbors.
It is possible that inteins do not typically come to fixation but rather achieve an equilibrium with their empty targets within the gene pool.
It should be noted, however, that the TRAs should not be used to normalise the platelet count but rather achieve a safe platelet count.
I'd rather achieve being good really quickly and then pull back, just do the odd gig.
Woody Allen, when asked if he would like to achieve immortality through his work, replied that he would rather achieve it by not dying.
Or rather, achieving them is radically complex.
His insistence on the tiniest details of camera movement, expression and composition was a reminder to them — and also to me — that transparency, immediacy and a sense of immersion in life are not the automatic results of turning on a camera but rather effects achieved through the painstaking application of craft.
Any improvement of signal-to-noise ratio cannot be obtained by increasing the cosmic-ray source intensity but, rather, is achieved by increasing the sensitivity of detector.
The procedural conceptions defended by Friedman and Meyers exemplify an alternative approach in which autonomy is not tied to the structural features of an occurrent mental state but rather is achieved when the agent undergoes a historical process of critical reflection.
