The phrase "achieved mastery of" is correct and usable in written English.
You can use it when discussing someone who has reached a high level of skill or expertise in a particular area or subject.
Example: "After years of practice and dedication, she has achieved mastery of the violin."
Alternatives: "gained expertise in" or "attained proficiency in".
Russian-backed rebels groups or Russian forces based in eastern Ukraine have allegedly been shooting at planes and helicopters with Buk missiles over the last week in an attempt to achieve mastery of airspace.
Russian-backed rebel groups or Russian forces based in eastern Ukraine are said to have been shooting at planes and helicopters with Buk missiles over the last week in an attempt to achieve mastery of the airspace.
Let's assume that achieving mastery of a subject takes 20 years of dedicated training, and work backward from there applying the 80/20 rule (see Figure 4).
Students generally perceived written assignments to be more helpful in achieving mastery of the course material than the online ones.
Now teachers are able to get this insight instantly in every class and change their teaching immediately to address any issues and ensure pupils achieve mastery of curriculum-mapped learning objectives.
If the student was unable to achieve mastery of the content, tutoring or extra instruction was provided in order to help the student reach mastery (Kuilk et al. 1990).
To respond to these challenges, the energy security studies should not only achieve mastery of the disciplinary knowledge underlying all three perspectives but also weave the theories, methods and knowledge from these different mindsets together in a unified interdisciplinary effort.
The Iranian Revolution and ensuing eight year war with Iraq slowed down progress in the nuclear arena but it did not change the belief of the leadership in Tehran that Iran must achieve mastery of the nuclear cycle.
Finally, evaluation is conducted to ensure that students achieve mastery of the competencies.
