Maintain humility

Let other people brag your achievements and not you saying it. If you always tell what you have achieved, they wont listen anyway, except if they ask you to talk about it. Make a room for something mysterious. A little of everything will make them crave for more rather than giving them so much that makes overtasted. 

Whenever talking to other people always ask something about the person talking to, rather than you giving information about yourself. Personally, we wanted to tell our own story and by letting you do that thing, gives you a positive perspective. 

Listen to their story, you will probably learn something from it. 

Whenever they praise you, say thank you or share the credit to those who helped you achieving the goal. Any praises build confidence but not your standard to be happy. 

To sum it up, stay your profile low. In this way, you can do things with less expectation and less pressure. Let your achievement boost without opening your mouth.