diff --git a/cinderclient/tests/unit/v3/test_shell.py b/cinderclient/tests/unit/v3/test_shell.py
index 80fd0fe..d2c12dd 100644
--- a/cinderclient/tests/unit/v3/test_shell.py
+++ b/cinderclient/tests/unit/v3/test_shell.py
@@ -133,7 +133,12 @@ class ShellTest(utils.TestCase):
               {'cmd': '--all-tenants 1',
                'expected': '?all_tenants=1'},
               {'cmd': '--all-tenants 1 --volume-id 12345',
-               'expected': '?all_tenants=1&volume_id=12345'}
+               'expected': '?all_tenants=1&volume_id=12345'},
+              {'cmd': '--all-tenants 1 --tenant 12345',
+               'expected': '?all_tenants=1&project_id=12345'},
+              {'cmd': '--tenant 12345',
+               'expected': '?all_tenants=1&project_id=12345'}
+
               )
     @ddt.unpack
     def test_attachment_list(self, cmd, expected):
diff --git a/cinderclient/v3/shell.py b/cinderclient/v3/shell.py
index 1e8c156..a4e402f 100644
--- a/cinderclient/v3/shell.py
+++ b/cinderclient/v3/shell.py
@@ -1303,6 +1303,7 @@ def do_snapshot_list(cs, args):
                      ['ID', 'Volume ID', 'Status', 'Name', 'Size'],
                      sortby_index=sortby_index)
 
+
 @api_versions.wraps('3.27')
 @utils.arg('--all-tenants',
            dest='all_tenants',
@@ -1310,7 +1311,7 @@ def do_snapshot_list(cs, args):
            nargs='?',
            type=int,
            const=1,
-           default=0,
+           default=utils.env('ALL_TENANTS', default=0),
            help='Shows details for all tenants. Admin only.')
 @utils.arg('--volume-id',
            metavar='<volume-id>',
@@ -1346,7 +1347,8 @@ def do_snapshot_list(cs, args):
 def do_attachment_list(cs, args):
     """Lists all attachments."""
     search_opts = {
-        'all_tenants': args.all_tenants,
+        'all_tenants': 1 if args.tenant else args.all_tenants,
+        'project_id': args.tenant,
         'status': args.status,
         'volume_id': args.volume_id,
     }
diff --git a/releasenotes/notes/bug-1675974-34edd5g9870e65b2.yaml b/releasenotes/notes/bug-1675974-34edd5g9870e65b2.yaml
new file mode 100644
index 0000000..14ef33c
--- /dev/null
+++ b/releasenotes/notes/bug-1675974-34edd5g9870e65b2.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - The 'tenant' argument was ignored when listing attachments,
+    and now has been fixed.
+    [Bug `1675974 <https://bugs.launchpad.net/bugs/1675974>`_]