Jerry Siegel got to return to his first love, science fiction, as editor of this comic book. And he (according to the credits from GCDb) also wrote the script for "The Asteroid Witch". Not surprising, since plenty of editors (Stan Lee, for instance) also hired themselves to write stories. There are no writing credits listed on any of the other stories here however. Lou Mougin seems pretty sure that Jerry wrote "The Asteroid Witch", but what about the other stories? And you know what? If you compare AMAZING Adventures #1 to DC's STRANGE Adventures #1 (edited by another old-time SF fan, Julius Schwartz), the Siegel-edited AMAZING does not come off too badly by comparison. Or for that matter, to another 1950 SF title, the Bill Gaines-edited WEIRD SCIENCE #1. Both first issues contained at least one story written by Gardner Fox, and it doesn't seem unlikely that he could have contributed to AA, as well. Harry Harrison also seems like a likely possibility (based on the inclusion of a Wallace Wood-drawn story) since the two men shared a studio at the time. Seems like Murphy Anderson would turn up almost everywhere there was any opportunity for drawing SF stories, whether it be DC, Ziff-Davis, Better/Standard, or Fiction House's PLANET COMICS.
Link to the book:
Amazing Adventures 1