Here's a prediction, in his final State of the Union address next week, President Obama will name these three things as major accomplishments: His treaty with Iran, the Paris Accords on Global Warming and his executive order on gun control. Ironically, none of these represent an actual accomplishment.
In reverse order, the executive orders on gun control mainly muddy the water on who is and who is not a gun dealer in the hope that more casual dealers will get licenses and perform background checks. This is unlikely to stop a single mass shooting since none of the previous shootings would have been stopped by background checks.
The Paris Accords set goals with no enforcement. It was a feel-good conference and will not cause any real changes.
The original goal of the treaty with Iran was to stop them from obtaining nuclear weapons. The final treaty does the exact opposite. It allows them to create nuclear weapons and obligates us to do nothing. Iran can leave the treaty at any time and has already threatened to if we take any action on their missile program. Snapping back the sanctions is a myth.
So, President Obama's big accomplishments are all paper triumphs.