well, i'm no baraka main, not even a huge fan. But based solely on the achievements, the evidence points to his inclusion.I want him too. But his model wasnt that detailed and he was on the right side of the screen, telling us hes a story bot.
a) There are no other story bots or npcs in the achievement pictures. Not even from story mode footage.
b) Everybody looks like shit in those pics. If this was any confirmed character, no one would question it.
c) No other shot is cropped to show characters and background that was about the background. The "ship" on that level isn't even pictured, so its obviously a shot about the character.
d) We already know what the "generic" tarkatan looks like, and that's not one of them. It resembles the probable leader Tarkatan in the story trailer, ie: Baraka
e) None of the other cameos (thus far) have been fightable. Chapter one alone bypasses a ton of other "cameos" who would all be much easier to simulate with existing assets than the tooth monster with blades in his arms.
So, either NRS is trolling mad hard by letting fans unlock a picture of a char they cannot have (never done that before) or Baraka is playable. Or worse, he's dlc and this is the viral advertising ever.