Maintain an Average 3.5% GDP Growth
The last time the GDP reached a 3.5% annual average was in 2005 and has not gone above 4% since the mid-eighties. As of the first anniversary of Trump's inauguration, the United States GDP had yet to hit anywhere near 3.5% annualized growth. The effects of some signature policies, including the GOP tax plan and various regulatory and policy changes has yet to be fully realized. Even so, these changes may not boost the economy as much as has been promised.
Through 2019, annual GDP growth peaked at about 3% the year before, but dipped back down to 2.2% making it impossible to achieve an average of 3.5% over Trump's first term, even without considering the deleterious economic effects of Covid in 2020.
Raise the Federal Minimum Wage
Trump's stance on the minimum wage shifted wildly over the course of his campaign, from eliminating it, to raising it, and back again. His public stance has remained constant since July 2016, however, in December 2016, Trump tapped Andy Puzder - a fast food executive who is on record as opposing the minimum wage - to lead the Department of Labor which regulates the minimum wage.
During the 2020 campaign cycle, Trump gave conflicting signals, saying he would support increasing the minimum wage if reelected, but further voiced that he would leave it to the states and that he had concerns about the effects on small businesses.
The Federal minimum wage is still at $7.25/hr, the same rate as 2009.
Punish Burning of the American Flag
A 1989 Supreme Court decision, Texas v. Johnson, said burning the flag is a protest protected by the First Amendment. Among those voting with the court majority in that case was the late Justice Antonin Scalia, who died in February, and whom Trump has repeatedly cited as a model for the kind of justice he would appoint to the nation's highest court.
While mostly quiet on the subject during the first few years of his presidency, Trump revived the idea of flag burning legislation during the 2020 campaign amidst the chaos of the George Floyd protests. The promise from 2016 was renewed for his 2020 campaign but with no specific actions taken.
Secure 95% of the African-American Vote in 2020
Despite a slight increase in the percentage of black men voting for Trump compared to 2016, Trump failed to crack 19% of the black male vote, and 10% of the black female vote.
Sue His Accusers
As of 2020 - four years after the election - no action has been taken by Trump to sue his accusers.
Eliminate National Debt in 8 Years
With over a year in office and both houses of Congress at his disposal, not only had the national debt not abated but it continued to shoot upwards by more than a Trillion dollars during 2017. The impact of the 2017 Republican tax plan was expected to increase the debt by a further $1.4 Trillion over a decade. Additionally, overtures towards "trade wars" over tariffs in early 2018 did not bode well for recovering on the debt.
As of June 2019, the national debt topped $22.023 Trillion, continuing an upward trend that had persisted across the entire span of Trump's first term to that point Additionally, chaotic trade policies, a trade war with China & other countries, and tepid revenue due to the Republican tax cuts of 2017 contributed to CBO predictions of an annual deficit of 4.9% per year after 2020. In plain terms, that means that the debt will continue to climb for the foreseeable future owing continued deficits.
The Corona Virus crisis of 2020 added further strain to the debt with the CBO predicting that the debt will roughly equal the size of the entire American economy by the end of the year.
Implement "Penny Plan" to Reduce Government Spending
Such spending cuts would have been difficult to achieve given the number of programs Trump promised, but his administration did propose a number of cuts such as a "10 penny" plan in 2017 and a blanket 5% budget cut from departments in 2018. and Rand Paul put a penny plan to a vote in the Senate in 2019. None of these proposals remained intact through the budget cycles.
Increase Use of Nationwide E-verify System
Trump's own businesses began using E-Verify in 2019 and his administration's proposed 2020 plan would increase the number of Federal agencies that use the system, but no concerted effort has yet been made to mandate or otherwise increase use of the system otherwise.
Eliminate Gun Free Zones
Trump reaffirmed his commitment to eliminating gun-free zones in May 2016, but clarified his position on guns in schools, saying "I don't want to have guns in classrooms, although in some cases teachers should have guns in classrooms, frankly,"
As of 21 January, 2017, after a full 24 hours in office, this promise had not been addressed. Though it is not clear how exactly the President could implement such a ban, aside from his continued rhetoric against Gun Free Zones he took no further action to achieve this promise.
Eliminate Gun Crime in Cities
As a promise, this one is particularly difficult to measure but likely the intent was to impact gun-related homicides in general. Having taken no specific action to stem the tide of gun violence, and in some cases making it harder to control, there has so far been no discernible positive effect on gun violence in the US.