The phrase 'milestone towards' is correct and usable in written English.
You can use it to refer to a significant event or achievement that marks progress towards a goal. For example: Winning the game was a major milestone towards our team's ultimate goal of winning the league championship.
The defeat of Lee Sedol, the world's strongest Go player, by a Google AI program, looks like another milestone towards a world where computers can do almost anything a human can.
But the prototype weapon's successful test in April 2011 was a milestone towards the employment of lasers, microwaves and similar "direct-energy weapons" on warships in the coming years.
It means 2015 is highly likely to be the warmest year on record and the first to breach the 1C temperature milestone towards the 2C threshold, Met Office scientists said.
The "flight marks another key milestone towards opening the space frontier for private individuals, researchers, and explorers", John Gedmark, executive director of the Commercial Spaceflight Federation, said in a statement.
Nevertheless, Clegg's commitment was certainly another milestone towards reforming a libel law that is hostile to free speech and scientific debate, and which is currently entirely on the side of rich corporations and powerful individuals who may wish to silence their critics, both here and around the world.
Tony Blair, the prime minister, hailed the achievement as "a significant milestone" towards Labour's new ambition of "the modern version of full employment".The celebration of the fall in claimant unemployment is a bit rich in view of the contempt that Labour heaped upon this measure of joblessness when it was in opposition.
She also reflected on 50 years of milestones towards equality.
Firms get paid when they begin a project and when they reach milestones towards finishing it.
During the last four decades, there have been some key milestones towards the development of EGS for heat production and electricity generation.
The major technological advances and milestones towards the practical utilization of electrochemical promotion are surveyed in view of electrocatalysts development and system/reactor engineering.
For each category, an introduction covering important milestones towards its development is followed by the presentation of the relevant policies and a description of their purpose.
