It isn't clear his FBI and DOJ will cease existing investigations. It appears he may let the email server case stay asleep, but that doesn't mean the many other investigations would be stopped.
If he does call a halt to all investigations it would be a terrible start for him. The allegations against Hillary for corruption via the family foundation are serious, and they have nothing to do with this election. Meaning that an investigation is not political retribution against her. We do want to be sure we don't become a banana republic where the succeeding administration jails the predecessors just because of ideology. The Clintons have apparently engaged in massive pay-to-play corruption while Hillary was SecState. That is a serious crime which may have seriously harmed the USA already. It needs to be investigated and, if guilty, Hillary needs to face the full punishment.
The ruling elite are not above the law. If Trump issues the Clintons a free pass it will completely undermine his moral authority.
Most people who oppose ACA do see some good stuff in there. I'll wait to see what he does, but I am optimistic he will repeal the really offensive parts of it and get something much better in place.
The wall. Not too many people expected a literal wall the entire length of the southern border. It really is accurate what someone wrote a few months ago, Trump supporters take him seriously but not literally, whereas the left takes him literally but not seriously. His supporters expect physical barriers, tech barriers, law enforcement, and human patrols to be enacted which greatly improve the security of the borders.