It does seem that the president is using the "acting" designation in order to get around the Senate's confirmation responsibilities. See the latest "Acting" job announcement, Stephen Miller ally tapped as top Homeland Security attorney
Here is a complete List of positions filled by presidential appointment with Senate confirmation
In case you are wondering, here is the entire DHS List of Positions:
Department of Homeland Security
- Secretary
- Deputy Secretary
- Under Secretary for Management
- Under Secretary for National Protection and Programs
- Assistant Secretary – Policy
- Assistant Secretary – U.S. Immigration and Customs Enforcement
- Assistant Secretary of Transportation Security – Transportation Security Administration
- Administrator - Transportation Security Administration
- Administrator - Federal Emergency Management Agency
- Deputy Administrator, Federal Emergency Management Agency
- Deputy Administrator for National Preparedness, Federal Emergency Management Agency
- Chief Financial Officer
- General Counsel
- Inspector General