Correct. If you are planning on using your models for a real-time 3D game, then there is no reason that you need a renderer. All a renderer does is generate a 2D image of your model, although usually a very pretty one.
As long as AC3D exports to the format your game engine can read, or you can write code to read an AC3D file (see several examples here:
http://www.inivis.com/resources.html) then you should be all set.