What can stop me from getting a PhD degree? I am mid stage PhD student. I have done qualification exam and course work etc and from last around one year I am working on a one research problem. There is small progress on that problem, but till needs to add more things to make it publishable. I am also aware that in the field I am working research gets their PhD with 1-2 papers and even I have heard they can award me a PhD without even a single publication ( I have seen few online ). Some senior researcher told that TAing etc also a part of work and should be considered as a integral part of PhD. 

Question : Is it possible to get a PhD without a single publication? What can stop me from getting a PhD? Other than If I show a bad behaviour etc
It is pretty rare that one gets a doctorate without publications and/or an acceptable dissertation. What is "common" in your field has little relevance to your particular situation. You need to make your advisor and maybe a committee satisfied that you have done work of sufficient quality. Your requirements are local to a University, or, perhaps, to the regulations of a particular country. 

Serving as a TA may get you better recommendations for an academic job after you finish, but have little relevance for the doctorate itself. 

Yes, bad behavior would stop you most likely, but you need to focus on the research that leads to acceptance. 

Complaining to a supervisor that "others have done it" will likely get you precisely nowhere - if not set back. 



In another question here you have indicated you are in your fourth year. This makes me wonder whether you are getting sufficient guidance from your PhD supervisor/advisor. If not, you might try to improve your relationship with him/her in hopes of obtaining the guidance you need. Four years isn't yet excessively long in the current situation, but you should  assess your progress and make sure you and your advisor agree on a plan for completion.