If you believe it, you can achieve it.

如果你相信，你就能做到。

youdao

If you can dream it, you can achieve it.

只要你敢作梦，你就能实现它。

youdao

If you can imagine it, you can achieve it.

如果你能够想像，你就能实现。

youdao

If you can see it and believe it, you can achieve it.

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After all, the more people who know what it is that you want, and what you can do, the more who can help you achieve it.

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There's a term that's used in economics often as a derogatory term: fine tuning, in the sense that that's a silly thing to try because you can't achieve it.

NPR: Alan Greenspan and the Federal Reserve