Weird faces on retopologized mesh does anybody know what could be causing these artefacts?

So far i have tried different render engines, using cage/no cage to bake, trying different uv seams, adding more detail, but to no avail...

!!!EDIT: so I figured it has nothing to do with baking aspect, the weird faces still persist even when no normal map or material is applied.

Here is the file with retopologized version: enter link description here
Well, it's definitely terminator problem. It's one of "problems" of Cycles render. To avoid it, you should  make lights bigger or/and add some subdivisions on model. 

No artifacts with subsurf at level 1:


But if you want to export it to Unity, this problem doesn't appear in it. It's a problem of ray-traced renderes.