Bin Laden was killed under his watch.
Repealed DADT
Stimulated the car industry, creating 250,000 jobs.
Dodd-Frank Act.
New START Arms Control Treaty.
Paris Agreement (assuming Trump doesn't fuck it up).
Lilly Ledbetter Fair Pay Act.
Limited the effect of the recession on the US (go ahead, compare what happened there in the US to what happened in Europe. You coped much better).
Gave FDA authority over tobacco (seriously, how was this not already a thing?)
Yeah, I know I'm not including Obamacare on this list. Not because I don't consider it an achievement, but because I know you won't & you'd probably just dismiss any list that included it, so I left it off.
Oh, and the electorate didn't decide Trump was a better choice than Obama - they decided he was better than
Hillary Clinton. Not the same thing. If Obama was eligible for a 3rd term he would have destroyed Trump. When you say that Trump is better just because he replaced Obama you are effectively saying that every President is better than their predecessor - who would also have been better than their predecessor. By that logic every President is better than every President that came before them. So Nixon was a better President than Lincoln. And the worst President the US ever had was George Washington.