Pass muster is a commonly used phrase to imply that someone has met the expected standards or requirements. However, there are several synonyms that can be used in its place that add a bit more variety to your language. For instance, the word "measure up" can be used to suggest that the person has met the minimum requirements set for a task. "Cut the mustard" is another synonym, implying that the person has performed the job to a high standard. "Make the grade" suggests that the person has performed to the level acceptable for the task at hand. Other synonyms for the phrase include "meet expectations," "satisfy specifications," and "pass inspection".