He worked tirelessly and ultimately preserved the Union, emancipated slaves in Confederacy (which led to the 13th Amendment), and he had an usually large hand in the military dealings of what Civil War. That is, he was quite vocal to Grant about military strategies and policy.
The main thing that makes him special is the propaganda in our public school system. He is not what he appears to be.
Contrary to popular belief, Lincoln wasn't fighting to end slavery. Lincoln was a tyrant fighting for his political legacy:
"The U.S. was the only country in the entire world during that time where war was associated with emancipation. The British and Spanish empires, and the French and Danish colonies all chose the peaceful route to emancipation, which occurred in Argentina, Columbia, Chile, all of Central America, Mexico, Bolivia, Uruguay, Ecuador, Peru, Venezuela, and elsewhere prior to Lincoln’s war. Brazil ended slavery peacefully after the war. Ninety-four percent of all the slaves that were brought to the Western Hemisphere were brought to these countries; about 6 percent ended up in the United States. The former group was emancipated peacefully. Lincoln never utilized his legendary political skills to do what the rest of the world did with regard to slavery, and end it peacefully."
"My paramount object in this struggle is to save the Union, and is not either to save or to destroy slavery. If I could save the Union without freeing any slave I would do it, and if I could save it by freeing all the slaves I would do it; and if I could save it by freeing some and leaving others alone I would also do that. What I do about slavery, and the colored race, I do because I believe it helps to save the Union; and what I forbear, I forbear because I do not believe it would help to save the Union. I shall do less whenever I shall believe what I am doing hurts the cause, and I shall do more whenever I shall believe doing more will help the cause." The Collected Works of Abraham Lincoln edited by Roy P. Basler, Volume V, "Letter to Horace Greeley" (August 22, 1862), p. 388.
"I will say then that I am not, nor ever have been in favor of bringing about in anyway the social and political equality of the white and black races - that I am not nor ever have been in favor of making voters or jurors of negroes, nor of qualifying them to hold office, nor to intermarry with white people; and I will say in addition to this that there is a physical difference between the white and black races which I believe will forever forbid the two races living together on terms of social and political equality. And inasmuch as they cannot so live, while they do remain together there must be the position of superior and inferior, and I as much as any other man am in favor of having the superior position assigned to the white race." The Collected Works of Abraham Lincoln edited by Roy P. Basler, Volume III, "Fourth Debate with Stephen A. Douglas at Charleston, Illinois" (September 18, 1858), pp. 145-146.