Kraid is right…
For now there is not an easy way to import from ArchiCAD to UE4 models or from another BIM software…
I have been working on these myself too… and make it work but you have to invest a lot of time to make all the necessary UVs, its almost like remake all the model again as NathanNaz said…
I understand yor feeling, im architect and i use archicad because it very good at what it was designed for, but for now is not wort it, maybe if graphisoft or someone else make a plugin to import models from archicad that would be great…