But what enemies?
The Silth?
Creatures on 1 planet?
Corporate Weasels and underworld thugs??
Enemies/Monsters will depend on the type of game, and the extent of the game being played. There are too many different possibilities as to what can be done with the system. A Fantasy setting is much less complex in most cases and has only a few standard tropes and archetypes to deal with.
On the other hand, in SF, you have cyberpunk, you have bladerunner, you have star trek, you have star wars, you have babylon5, exploration, battlestar galactica, Space: Above and Beyond, etc. etc. etc. etc.
Endless varieties. We even have one fellow saying that we shouldn't include aliens, even though these aliens are part of the default setting sprinkled throughout the product.
In other words, it is going to be nigh impossible to come up with a list of specific enemies when we have so much diversity among the types of campaigns that can be run.