The phrase "acquired only by" is correct and usable in written English.
It can be used to indicate that something can be obtained through a specific means or method, emphasizing exclusivity.
Example: "This level of expertise is acquired only by years of dedicated practice and study."
Alternatives: "obtained solely through" or "gained exclusively by".
"Tap dancing, however, is an utterly unnatural skill, acquired only by time and great effort".
The barber's trade was acquired only by a long apprenticeship until the 1890s, when schools for barbering were established.
Another character wears a Victoria's Secret-style bra that she could have acquired only by time travel.
Because the law was highly technical, proficiency could be acquired only by following the demanding studies of the Inns.
Land, water, and interests in land and water owned by the State of Louisiana or any political subdivision thereof may be acquired only by donation.
Any lands or interests therein owned by the State of Georgia, or any political subdivision thereof may be acquired only by donation.
Still, both countries are seeking greater diplomatic clout that they apparently reckon they can acquire only by constraining the United States.
Until, that is, Nov. 27, 2002, when United States postal inspectors swooped down on this quiet rural crossroads between Amarillo and Lubbock and busted the quaint operation -- acquired only months before by an Austin couple through thoroughly modern eBay.
Its neighbor is in some ways even better because it is rarer: a truly great painting by Robert Motherwell, acquired only in 1997.
Finally, a strategy is demonstrated that allows for the measurement of the 14N quadrupolar parameters for any nitrogen moiety whose quadrupolar coupling constant falls within the range 0.8≤|CQ|≤1.5 MHz, by acquiring only two 14N NMR sub-spectra at strategically located transmitter frequencies; these results are compared to full powder patterns which are acquired using frequency-stepped methods.
In this study, eyespots are assumed to redeploy to new locations by acquiring only one new kind of positional information at a time.
