This is the full text of the decision: TRUMP v. INTERNATIONAL REFUGEE ASSISTANCE PROJECT directly from the Supreme Court website.
is used by the decision. This means that justices who agree with the decision are not named, but only justices who dissent are named. In this case, there is an aspect of the decision that is unanimous.
The court does not characterize executive order 13780 as a "Muslim Ban". Instead, the decision says "[w]e grant the petitions for certiorari", which means that the court agrees to later hear an appeal of the lower court decisions which characterize the purpose of the ban as religious.
The decision does not completely stay the injunction of the executive order.
The decision only stays the injunction of the executive order as far as it applies to "foreign nationals who lack any bona fide relationship with a person or entity in the United States".
Justices Thomas, Alito and Gorsuch dissented in part, in that they would have stayed the injunction entirely.
So, in summary, it was unanimous that at least the partial stay was appropriate, but three justices wanted the injunction entirely stayed.