翻译：通过刻苦学习，你一定会达到目标

Through hard study, you reach a certain goal.
By studying assiduously, you are sure to achieve self's aim .
有两种不同的答案，但我觉得第二种比较好一点，但是吧，第一种也没错误，你自己选一个吧！！！

高级英语：
通过刻苦学习，你一定会达到目标
Pass the assiduous study, you will certainly attain the target

By working hard，you are sure to make it.

you will definitely reach your goals through hard work

1)you can achieve your goal by hard work
2)hard work will lead you achieve\realise your goal

You can achieve your aim as long as you work hard!