Here are the charges:

1. Fast and Furious - Allowed 2000 firearms across the border to trace them to drug cartels and lost track of them. A US border agent was killed with one of those guns. Obama administration stonewalled and obstructed the investigation into what happened.
2. Eric Holder Perjury, Contempt of Congress. Attorney General Eric Holder falsely claimed to not know about Fast and Furious. Holder was held in contempt of Congress in a bipartisan vote, for obstructing the investigation. https://www.theatlantic.com/politics/archive/2013/05/eric-holder-lie-under-oath/314812/
3. Holder refused to prosecute Black Panther voter intimidation. Clear case caught on video. Obama administration won the case by default when the NBPP didn’t show up in court, but decided to dismiss the charges. Obstructed the Congressional investigation.
4. Sestak job offer scandal - Obama violated at least 4 federal laws by offering Congressman Joe Sestak (D-Pa.) a job in his administration in exchange for not challenging Arlen Specter for the Democratic nomination for U.S. Senate. Specter had recently switched from the GOP to the Democratic Party, and that switch was contingent on support from Obama. https://www.washingtontimes.com/news/2009/dec/06/justice-thwarts-black-panther-subpoenas/
5. Spying on journalists (AP, James Rosen, Times reporter James Risen, Sharyl Attkisson). AG Eric Holder signed illegal warrant naming James Rosen as co-conspiator to espionage and flight risk then lied to Congress under oath that he didn't know of any surveilence of journalists. Obama DoJ threatened, harassed, and intimidated Risen to give up confidential sources. Federal investigators pored over Risen's credit reports and personal bank records. They tracked his phone logs and movements. https://www.politico.com/blogs/media/2015/02/risen-obama-administration-is-greatest-enemy-of-press-freedom-202707
6. Unconstitutional recess appointments - unilaterally declared that the Senate was not in session in violation of the Constitution to ram through appointments. Supreme Court eventually unanimously struck down.
7. Solyndra - Obama Energy Department provided a $535 million loan guarantee to the political donor run solar panel firm just before going bankrupt. Obstructed Congressional investigation afterward. https://www.foxnews.com/politics/white-house-fires-back-at-overbroad-subpoena-on-solyndra-documents
8. Unilateral (and illegal) changes to Obamacare. Obstructed Congressional investigation into the rule changing process. https://thehill.com/policy/healthcare/244069-cruz-slams-obama-officials-for-refusing-to-testify
9. IRS targeting political opponents. Director of the IRS Exempt Organizations division Lois Lerner pleads the 5th to all questions in congressional investigation. Obama DoJ then refused to enforce Congress's contempt citation against Lerner. She is not even fired but allowed to retire.
10. Veteran Administration deaths and secret waiting lists. At a Phoenix VA facility at least 40 veterans died waiting for appointments many of whom had been on a secret waiting list, part of an effort to conceal that between 1,400 and 1,600 veterans were forced to wait months for appointments.
11. NSA spying on Americans
12. Benghazi (multiple scandals, failed to protect, failed to react, lied about the cause, cover-up, obstructed the investigation). Obama failed to protect a US diplomatic compound asking for help for months. Ambassador Chris Stevens and three others were killed in the attack. Obama failed to send any help in time. Then he tried to cover it up. His State Dept falsely claimed the attack was not a terrorist attack but a reaction to an anti-Muslim film. He sent Susan Rice on a disinformation campaign to lie to friendly media. Then obstructed Congressional investigation. Hillary Clinton deleted thousands of subpoenaed emails.
13. Israeli election interference. Used US taxpayer money to attempt oust of Netanyahu. https://m.washingtontimes.com/news/2016/jul/12/obama-admin-sent-taxpayer-money-oust-netanyahu/
14. Hillary private server (spoliation of evidence, Espionage Act violations, FBI cover-up). Obama and senior officials knew for years that Hillary had a private email system that she used avoid oversight, subpoenas, FOIA requests. Obama's DoJ knew Hillary had many Secret and Top Secret documents on private computers open to hacking.
15. Let Hezbollah sell run narcotics/launder money through the US to fund terror operations to placate Iran in pursuit of his JCPOA nuclear deal. https://www.politico.com/interactives/2017/obama-hezbollah-drug-trafficking-investigation/
16. Lied about JCPOA Iran Deal contents. White House led a comprehensive disinformation campaign to friendly media. Ben Rhodes bragged "We created an echo chamber. They were saying things that validated what we had given them to say." https://nypost.com/2016/05/05/playing-the-press-and-the-public-for-chumps-to-sell-the-iran-deal/
17. Transferred $1.7 billion to Iran in cash to thwart banking sanctions. AG Loretta Lynch refused to answer questions from Congress about the payments. https://www.latimes.com/nation/nationnow/la-na-iran-payment-cash-20160907-snap-story.html
18. Prisoner swap of the Taliban Five (senior commanders) for 1 treasonous deserter Bowe Bergdahl
19. DACA - Created the program from thin air without any statutory basis and in clear violation of standing immigration law. Violation of the Take Care Clause which requires the president to obey and enforce all laws.
20. Spying on Trump campaign. Lied to FISA court.
21. Constant Obstruction of oversight - exerted Executive Privilege, fought Congressional subpoenas, set records on most denied FOIA requests (77%). Spent millions in taxpayer dollars to fight FOIA requests (a record $36.2 million on legal costs in 2016). Obstructed IGs. In Aug 2014, 47 of 73 inspectors general wrote an open letter to Congress informing them that the Obama administration of obstructing investigations by not giving them full access to the information they needed to investigate properly. https://pjmedia.com/trending/9-times-the-obama-administration-fought-subpoenas-or-blocked-officials-from-testifying-before-congress/