| ACHA | Accrediation Complaince of Hospitals in America 
| Others |
| ACHA | Adult Congenital Heart Association
| Others |
| ACHA | African Centre For Human Advocacy
| Others |
| ACHA | Alachua County Housing Authority
| Others |
| ACHA | Allegheny County Housing Authority
| Others |
| ACHA | American Catholic Historical Association
| Others |
| ACHA | American College Health Association
| Others |
| ACHA | American College Helath Association
| Others |
| ACHA | American College Hockey Association
| Others |
| ACHA | American College of Healthcare Administrators
| Others |
| ACHA | American College of Healthcare Architects
| Others |
| ACHA | American Collegiate Hockey Association
| Others |
| ACHA | American Collegiate Horsemen's Association
| Others |
| ACHA | American Coon Hunters Association
| Others |
| ACHA | American Cutting Horse Association
| Others |
| ACHA | Antwerp City Home Apartments
| Others |
| ACHA | Applied and Computational Harmonic Analysis
| Others |
| ACHA | Argyll Community Housing Association
| Others |
| ACHA | Asian Conference on Hepatitis and AIDS
| Others |
| ACHA | Association for Communal Harmony in Asia
| Others |
| ACHA | AWG Cloud Height Algorithm
| Others |