"celebrate this milestone" is correct and can be used in written English. You can use it to describe an accomplishment or a special occasion. For example, "My daughter graduated college last week—let's celebrate this milestone together!".
Our purpose is to do more than celebrate this milestone.
So how will secular, multicultural Britain celebrate this milestone?
"While we celebrate this milestone I want to remind everyone that we must remain vigilant.
Reyes, who is personally responsible for 133 of the 500,000-plus errors, including 16 this year entering Tuesday, did not take himself out of the game to celebrate this milestone.
It celebrated this milestone with a self-proclaimed holiday and a blog post reporting that people are more connected than they have ever been before.
Dr Celeste Philip, Florida's surgeon general, said she was "as happy as anyone here to be celebrating this milestone" but warned against complacency.
The Museum of Modern Art is celebrating this milestone with a screening series of the company's shorts and feature films, taking viewers from the ocean depths of "Finding Nemo" to the stratospheric dreams of "Up".
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK