How we call someone who knows what he wants and he is focused in achieving it [closed]
I'd suggest driven. From Oxford Living Dictionaries:
(of a person) relentlessly compelled by the need to accomplish a goal; very hard-working and ambitious.
You might choose the word "purposed" or "purposeful" to describe such a person. If a stronger word is required, then perhaps "adamant" might work.
https://www.thefreedictionary.com/purposeful
https://www.thefreedictionary.com/adamant