There are research formats that do not include assumptions which I believe there should be to have an anchor or point of reference in making the analyses and interpretations.
Most everything studied has assumptions of some sort or another. The assumption might be the with the distribution of the data, e.g. normality. The assumption may have to do with the use of the statistical technique, e.g. ordinary least squares regression has 5 assumptions. An assumption may be made of the human population, e.g. people are rational, or investors are risk-averse.
Based on Logical Concepts, according to Dr. Steve Gimbel - Gettysburg College - any work would need not just beliefs, but logical beliefs that must be correct. Logic is the study of rational argumentation.
An argument is a set of sentences, such that one sentence (that we call 'the conclusion') is claimed to follow from the other sentence (what we call 'the premises').
The conclusion is the point of the argument. We give arguments to provide legitim reasons to believe the conclusion. The premises are those reasons. The premises are the ground to support rational belief and the conclusion.
The assumptions are these premises.
In other words, no way to have trustable conclusions without reasonable assumptions.
I hope I did not misunderstand your question but any possible argument or line of thought is predicated "explicitly or implicitly" on assumptions of some sort. So, deciding that you have taken this for granted, I believe your concern is whether it is plausible to exclude a presentation of those assumptions. It largely depends on the "template" - for example, journal policies - which you are required to adhere to. Overall, my answer is: It is possible to not explicitly express research assumptions unless they cannot be inferred in any possible way.
For reaching one destination, Researcher need to take some decisions and then make that plan as real by hard work and patience. Here, the decisions are assumptions and working according to the plan is research. I think both are equally important. Thanks and Regards, Craig Refugio.
I think assumptions do not need to be published along, but to the researhcer, they are helpful in the determination of methods and tools to use for the research.