The phrase "achieved solely" is correct and usable in written English.
It can be used to emphasize that something was accomplished without any other factors or contributions involved.
Example: "The project was achieved solely through the team's hard work and dedication."
Alternatives: "accomplished exclusively" or "attained only".
Meanwhile in India and elsewhere, cooling is being achieved solely with air pumped from underground tunnels.
According to the Pentagon's counterinsurgency doctrine, victory in Afghanistan cannot be achieved solely by military force.
But he questioned whether management's targets could be achieved solely through voluntary means.
As a Venezuelan and MIT graduate I am doubly proud of your trajectory achieved solely with your own effort.
Justice Kennedy emphasized that the reduction in population need not be achieved solely by releasing prisoners early.
A project such as this cannot be achieved solely by academics as they would not be able to complete the enormous task over one evening.
(This is hard to achieve solely by prosecuting violent crime, major hard-drug trading, and white-collar crime).
Still, he expressed concern that management's goals would be hard to achieve solely through voluntary means within 18 months.
Continuing developments in underlying NMR technology alongside software and hardware developments for complementary computational approaches now enable methodologies to routinely provide spatial directionality and structural representations traditionally harder to achieve solely using NMR spectroscopy.
Some of them are achieved through solely musical terms.
High-quality reference genomes also allow confident genome-wide detection of large structural variations, which cannot be achieved unambiguously solely by re-sequencing analysis.
