Unlockable       How to Unlock
--------------------------------
Bad Ending     - Wait for Alexander to open and enter the portal.
Good Ending    - Wait for Alexander to open up the portal. Once it opens place Agrippa's
                 head into it.
Revenge Ending - While Alexander is waiting for the portal to open  push over the three 
                 pillars that are giving it energy.
Another Ending - When Alexander locks you in the cell and tells you to stay there and 
                 be killed by the shadow, don't escape. If you simply sit there the red
                 shadow stuff will enter the cell and kill you. You will hear the same 
                 words from Alexander as in the Bad Ending when you let him enter the
                 portal.