No, you cannot use the same attorney as an attorney cannot represent two adverse parties. This is a basic tenet of law and the same reason that you wouldn't want the lawyer defending you in court to also represent the person suing you. A divorce is no different; each spouse has their own interests at stake. There are different ways of viewing a case, and much to be argued over. An attorney has a duty to zealously advocate for his client's position, and cannot work against his client's interests by advising the other side. This means that your attorney cannot do anything to help your spouse whom you are trying to divorce. Bottom line: everyone needs their own attorney.
Yes, however, you can get divorced using only one attorney. Most of my clients seeking an uncontested divorce have already come to an agreement about their children and finances, and simply want an attorney to "put the court papers together." They only need their Marital Settlement Agreement and Joint Parenting Agreements professionally drafted, and help them get in front of the judge to have their divorce finalized without wasting time. In these situations, only one attorney is necessary to have the process completed.
An important caveat, though, is that even if only one attorney is involved, that attorney can represent only one party. The other spouse must go it alone, being "unrepresented." They will have to state in their agreement, in the judgment of dissolution, and on the record in front of the judge that he or she consulted counsel or knowingly waived that right. It may be a little more costly to engage two attorneys, but that way each party knows that their interests were well represented.