Whenever possible, you should speak about your achievements from the perspective of an employer (helping them to find new customers, helping them to improve their reputation, building good atmosphere on the workplace, earning more money, etc), rather than achievements from your own perspective (getting promoted, earning a degree or certification, etc).

I think the most difficult situation I face as a production manager is when I have to lay off staff, either because they aren’t doing their job properly or, even worse, because sales are down. When I can, I try to work with underperforming personnel to see if we can’t improve their efficiency. If not, then I hand them their pink slip and give them straightforward reasons for why they are being laid off. No one wants to be fired without an explanation. When this happens, I keep my tone polite and avoid using too many “you” statements; I absolutely do not want to cast shame on them. 
Companies ask this for a number of reasons, from wanting to see what the competition is for you to sniffing out whether you're serious about the industry. “Often the best approach is to mention that you are exploring a number of other similar options in the company's industry,” says job search expert Alison Doyle. “It can be helpful to mention that a common characteristic of all the jobs you are applying to is the opportunity to apply some critical abilities and skills that you possess. For example, you might say 'I am applying for several positions with IT consulting firms where I can analyze client needs and translate them to development teams in order to find solutions to technology problems.'”
OK, if you get the admittedly much tougher follow-up question as to why you were let go (and the truth isn't exactly pretty), your best bet is to be honest (the job-seeking world is small, after all). But it doesn't have to be a deal-breaker. Share how you’ve grown and how you approach your job and life now as a result. If you can position the learning experience as an advantage for this next job, even better.
When answering this question, interview coach Pamela Skillings recommends being accurate (share your true strengths, not those you think the interviewer wants to hear); relevant (choose your strengths that are most targeted to this particular position); and specific (for example, instead of “people skills,” choose “persuasive communication” or “relationship building”). Then, follow up with an example of how you've demonstrated these traits in a professional setting.

Interview Questions How to Answer?

You describe in the job listing that you are looking for a special education assistant teacher with an abundance of patience and compassion. Having served as a tutor at a summer school for dyslexic children for the past two years, I have developed my ability to be extremely patient while still achieving academic gains with my students. My experience teaching phonics to children aged 6 to 18 has taught me strategies for working with children of all ages and abilities, always with a smile.

Interview Question Why Do You Want This Job

Remember that employers hire workers to solve a problem, whether it’s boosting sales or streamlining processes or building a brand. Your goal when making your pitch is to show that you’re the best person to solve that problem. Interviewers ask questions about why you should be hired to measure how you qualify for the job and fit in with the company.

Well, seriously, you might get asked brainteaser questions like these, especially in quantitative jobs. But remember that the interviewer doesn’t necessarily want an exact number—he wants to make sure that you understand what’s being asked of you, and that you can set into motion a systematic and logical way to respond. So, just take a deep breath, and start thinking through the math. (Yes, it’s OK to ask for a pen and paper!)
Example: “I would say that as a security officer, I’m vigilant, proactive and committed to ensuring safe, secure, and orderly environments. In my last incident response rating, I received a 99% against the team average, which has been at around 97% over the past 3 years. I like to be thorough, documenting all incidents. I’m also a lifelong learner, always seeking out the latest security equipment and techniques to patrol buildings. I frequently make suggestions to management about security improvements and changes as my motivation comes from making a meaningful contribution.”