Espero que entendí lo que buscás:
Código SQL:
Ver originalWITH T1 AS
(SELECT a.Actividad AS [ACTIVIDADES REALIZADAS], COUNT(b.Actividad) AS TOTALES
FROM Accesos_y_Clausuras AS a, Accesos_y_Clausuras AS b
WHERE (((b.[No])=[a].[No])) AND a.Fecha >= '2015-01-01' AND a.Fecha <= '2015-01-31'
GROUP BY a.Actividad),
T2 AS
(SELECT *,
Rank() OVER(ORDER BY TOTALES) Rnk
FROM T1)
SELECT *
FROM T2
ORDER BY CASE WHEN Rnk=1 THEN 2
WHEN [ACTIVIDADES REALIZADAS]<='Creación de Usuario' THEN 1
ELSE 3
END,
[ACTIVIDADES REALIZADAS];