This is the 15917th most frequent Turkish word.
ulaşacağını
"That you will reach/arrive at."
The word "ulaşacağını" in this sentence is used to indicate the future tense and an expectation or belief that someone would reach a certain goal.
O hedefe ulaşacağını biliyordum.
I knew that he/she would reach that goal.
Here, "ulaşacağını" expresses the conditional result of achieving success, tied to the condition of working.
Eğer çalışırsan, başarıya ulaşacağını göreceksin.
If you work hard, you will see that you will achieve success.
In this sentence, "ulaşacağını" signifies a probable outcome based on following the provided suggestion.