Amnesia works for both Mac and PC. Try not to run games in OS emulators, because they do not take full advantage of your hardware. It is possible to configure them to do so, though it frequently comes with problems. If you have a mac and want to play a PC only game, you can read up on Wine to take full advantage of your hardware. Although, not all games run on Wine.
See if your game runs with Wine first:
http://wiki.winehq.org/MacOSX
If not, you can try running your game using this tutorial:
http://www.instructables.com/id/Gaming-o...rkstation/
Your "terminal" is an actual application on your computer. It can by clicking the magnifying glass at the top right hand corner of your screen and typing in "terminal".