Okay, I played through the game as Terry and unlocked the in-game achievement for that, but no Galaxy achievement unlocket. They seem to be busted. Or is there some minimum difficulty setting rule or no continues (because I had to use two)?
Edit: Also the unlock rate among all players is still 0.0% for all character based achievements. Seems to be pretty unrealistic. So, I really think it is buggy.
When you say "in-game achievement" do you mean there is now an item unlocked in the Achievements section, or do you mean the Gallery section?
The requirements for the Gallery section are different, and Gallery unlocks are different than achievements.
When you finished the game, did you earn the opportunity to fight Kain or did it end with Grant? The achievement requires you to earn a match with Kain and defeat him.
As to the percentages, the numbers are still quite small. 0.0% is not actually 0 in this case, just less than 0.1%.