Passive writing
Broken/Incomplete sentences
True, some feel it is "voice" or "style", I am not among them. If you fancy using incomplete sentences, I am not the editor for you. When used infrequently, they can be good, powerful, but when overused as is common, they lose that impact. If you sign with me, expect to have 99% of your incomplete sentences edited out.
Excessive Adverbs or Adjectives
Particularly as tags on the end of dialogue. Don't do this. It's lazy. Rather than modify or qualify your adverb or adjective to express a relation of place, time, circumstance, manner, or degree, it is better to use a more powerful adverb or adjective in the first place. Or, you need better phrasing or lead up to it.
The trifecta will likely be different for every editor. The best thing to do is make sure you have edited your manuscript thoroughly to the best of your abilities, and do your research on who you are submitting to so you make sure they are right for you and your work.