What part of "Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn" don't you understand?
Don't you open that trapdoor!
At the beginining of the status phase you can claim one secret or one preliminary objective. In addition you can claim one public objective.
Also pertinent is the fact that you can also claim any number of special objectives.
In theory, you could claim a Secret Objective, Stage II objective and all four Artefacts, claiming a massive eight VPs in one turn (and likeley winning the game at that point)!