i know that impure visions arise due to ignorance and not staying in a calm natural space but can one still achieve enlightenment with impure thogal visions or are all thye enlightened masters getting pure visions and then enlightenment?

One completely abandons impure karmic visions, then practicing with pure visions eventually leads to Enlightenment. With pure visions there are still periods of tension/not staying calm prior to Enlightenment, but these are still completely distinct from impure karmic visions. Impure karmic visions are in indication that one still has a very long way to go, as that is still the beginning of the thogal path.