The two accreditations one would want with a nursing degree are: Regional accreditation and Program Accreditation (CCNE or NLN). Chamberlains has both regional accreditation and CCNE program accreditation.
However the following is listed on their website (and this is more to do with state requirements):
"At this time, Chamberlain College of Nursing cannot accept inquiries from the states of Washington D.C., Hawaii, Idaho, Kansas, Louisiana, New York, North Carolina, North Dakota, Oregon, Tennessee, or Washington for the MSN Family Nurse Practitioner Program."
Found at the bottom of this page: Family Nurse Practitioner, MSN-FNP Chamberlain College
I would imagine that if you lived in any of the above listed states, I would stay away from the program.
Best of Luck!