The misses have been well-discussed. What might be overlooked is what was accomplished by these latter day Keyston Kops. (A good summary is here. A summary from a conservative site here.)
Tighter enforcement on immigration. Many groups, including Haitians, have lost special status and are now subject to deportation. DACA for children brought to the US wasn't renewed. Flow across the border seems to be down (a trend over several years). Democrats are being pounded by their constituents over their failure to stop these immigration changes. But that just shows the unrealistic hopes of certain groups since the Dems have almost no power.
The tax reform/tax cut bill was passed, with major changes for both businesses, individuals, and households. It's hard for me to predict how this will affect the country in the long term. It may cause a big increase in deficits. However, if the increases are kept to around $100 billion a year, that's not too large in the scheme of things. So far businesses have responded in positive ways, so there is a chance that the economic benefits will outweigh the economic downsides. We'll have to wait to see, though not everyone agrees. Some are presuming it will be a failure, though partisanship is probably the motive.
Changes in regulations, and a big slowdown in new regulation. I personally think that the stability of much less new regulation is mostly a benefit. I'm not a business owner, but wonder how many are relieved with this change in particular. And I'm not talking about businesses that hope to drill in sea coasts or pollute.
No huge disasters. There haven't been any crises that have started and gotten worse. No blunders that ballooned into disasters. Does that count as an accomplishment? No, but I'm still grateful.
Extras. Not a close fit except for the aspect of a roundup of 2017. The most underreported news stories.