So I just pre-loaded Brink on Steam and under the achievement section it mentioned things called What-If missions. anyone know what these are?

Yeah, they are not story related and are to be considered non-canon to the main story

Apparently you unlock them for completing both sides campaigns

Example: Complete the Resistance Campaign to unlock ''A New Clear Age/The Reactor''

Mission that don't relate to the story line. Theyare mission that you can decide to do or decide not to do. I think it's a really cool aspect of the game. So that is what "what-if" missions are. :thumbsup:

Best answer anyone can give you.

That's cause Schwarzwewretgd is a scholar.