hmmm...Let me tell you the certifications which are pretty hot and without which you cannot expect to get a job in that particular field(untill and unless you are already in that field), atleast thats the case in India.
MCSE - It tells you about using Microsoft Servers in a network to control Active Directory, setup DNS & DHCP servers, Microsoft Exchange. This is a must for becoming Windows System Admin
RHCE - This is about Unix Administration. And is a very tough course to clear. Most of the big organisations in the world uses Unix servers, so a pretty safe bet.
CCNA - System Adminstration requires one to know networking concepts as well in depth, so even if you do not want to get into networking, this certification or its knowledge would help you miles in getting a System Administration job. If you want to get into networking then there are further courses as well like CCNP, CCIE but atleast CCIE is very very tough to clear, and one would need atleast 5-10 Years of real experience in creating/managing big networks before one can think of CCIE.
OCP - Once the Network and Servers have been setup, the real work of a company/software company starts, and most of these applications need Database. Access really is not even considered a Database in the real world,
, though I have used it as well, and its GUI format is so much easier to use, but it cannot handle even average sized databases which contains thousands/millions of rows of data, and is very heavy on server resources, you will never find it being used in any Software company.
But people of our age, or atleast me, I cannot think of studying for anymore certifications. I can only concentrate to study new hardware, 
, everything else makes me feel sleepy.