Always be punctual. Tardiness gives a very bad impression and undermines your chances for promotion. Reports have shown that after absenteeism, lack of punctuality is one of the most critical aspects in performance appraisals.
Always be ready to offer a smile to anyone you meet - known and unknown. You will be surprised how wonderful it feels at the end of the day - and how many friends you can make this way.
Make it a point to stay informed on all the development in the company - read the quarterly report, half-yearly report, yearly reports. Being informed is strength.
Make it a habit to be organized - spend every day 15-20 minutes to organize your day. This will improve your efficiency manifold. Have a dairy, notepad where you make daily 'to do' lists. Once this is done, prioritize the tasks you have, keeping the most difficult and time-taking ones for the time you are most active. If you are a morning person, do it in the morning - if you are a evening person do it in the evening. In this way, you will be able to concentrate better on the more difficult task.
Always be dependable. Treat deadlines with reverence. Always work within the deadlines. In case you find that you will not be able to make, inform the relevant authority/ person about the possible delay as soon as you know about it. This could help create a contingency plan and/or get others work on the project. Dependability is very important. Aim at being recognized as a highly dependable and responsible person. Always be the one to give a little extra.
Take care about the un-written laws of the office - never leave anything on the desk or office that could offend any of your colleagues. Be careful to refill the water cooler, coffee jug, or cold drinks in the fridge if you use them. The next person should find it all gone because you have not bothered to replace it.
As much as possible, develop a habit of having a working lunch. This not only saves time, it also gives you the opportunity to interact with your colleagues better. Lunch time if often the get-together time where a lot of life-time friendships/ networking stuff starts.
Have a set of extra clothes at office for that just-in-case time. It might rain all of a sudden and you find yourself totally drenched, you may need to work late and check in the company guest house for the night, and so on. It is good to always be prepared for an eventuality. As we are on the topic, you should have a toothbrush and paste there as well.
Ensure that you leave the lunch desk, toilet and your office clean and free of litter. Always be aware that your slip ups may inconvenience others.
Always go prepared for meetings. Read the agenda, be familiar with what will be discussed and be prepared to participate in the meeting. Carry all the relevant papers, reports, documents that you would need. In case you have a presentation to do, ensure that you have the required equipment. Nonetheless, always have a contingency plan - in case the LCD projector does not work, your presentation should not stop.