What is your greatest strength?
Interpret question as, what is your greatest relevant strength? Or Why should Company hire you? For this you will need to properly understand the job profile.
What is your greatest weakness?
Give a weakness which doesn’t relate to the job under discussion.
What is your greatest achievement?
Find a relevant answer in the recent past for this question
Are you ambitious?
You can say that I am very ambitious in the way that I don’t like to get to get a feeling of stagnancy. I want that I should always be getting new experiences and learning new things.