The phrase "achieve plan" refers to the successful completion of a set of actions or goals. There are several synonyms that can be used to replace this phrase. One alternative is "execute strategy," which emphasizes the strategic nature of the plan. Another option is "realize objective," which suggests the specific outcome that is sought. "Accomplish mission" is a more formal synonym that highlights the importance of the task at hand. "Fulfill agenda" is another option that implies the completion of a list of tasks. Whatever synonym is used, it's clear that successfully achieving a plan requires careful planning, focus, and diligence.