I am about to finish my bathroom in my basement made out of amic icf. My question is do I have to install gyprock 1st, or can I install the directly to the foam. Any ideas or suggestions wouild be appreciated

I assume that is "Amvic", but you also left out a noun. What is the ceramic "the" you are installing?

If you plan to install tile on the walls, you can skip the drywall but do use cement backerboard behind the tile.  Since the ICF will be continuous, you can use the thinner backerboard and save some money and weight.  However, thicker backerboard should be used behind tile on stud walls.

I should have previewed 1st, sorry about that. Yes i plan on ceramic tiles for the wall, and floor for the bathroom. 3 walls are Amvic icf, a stud wall for the other.