During the fight with Richter as Alucard you must equip the Holy Glasses and get both Richter and the orb controlling him close to death. When you have them both at low health hit them both at the same time to kill both at the same time. The easiest way to do this is with a bomb type item (Power of Sire, Pentagram, etc.) or it can be done with a regular weapon while they are close together. The battle will end as if you had only defeated the orb only you do not get the "Topsy Turvy" achievement and now you will fight Richter again if you enter the room again. If you defeat Richter again you will get the "Topsy Turvy" achievement but will be stuck in the room with Richter and Shaft as no cinematic starts up. To fix the glitch you must beat Richter and then exit with a library card and save your game.