Translation of "Accomplish" in Chinese

Did you accomplish the task?

你成功完成任務了嗎？

How did you accomplish this?

你怎么完成的？

Did you accomplish your goals?

你達成你的目標了嗎？

He is sure to accomplish his purpose.

他很肯定可以达到目标。

The task is so difficult that I cannot accomplish it.

這個任務非常困難, 我無法完成。