When Walton listens to his men and turns his ship homeward rather than risk their lives, is he accurate in his statement that he has lost his hopes for glory?

In the sense that he is giving up on finding the Northwest Passage and learning the secret of the magnet, yes, Captain Walton is correct in saying that he has lost all hopes for achieving personal glory. However, on the other hand, it is notable that he made the choice Victor Frankenstein would not: he exercised forethought and placed the most value on the lives of others, his crew members. He did not, as Victor did, think of his glory first and everyone and everything else second (or third, or tenth . . .). When Walton's men tell him that they want to go home, he listens to them because he doesn't feel that he can force them to risk their lives when they do not want to do so.
Victor, however, never considered others' needs when making his creature: he didn't think of the fear the world might have of such a huge, superhuman creation, nor did he consider the feelings this creation might have. He considered only his own. In this sense, then, Captain Walton's glory could be in keeping his men alive, in allowing them to think for themselves and in honoring their decisions. Though he wouldn't call that glorious, they likely would.