Posted on 20 February 14 at 17:42
You're probably doing something wrong. If you indeed deleted the Title Update, you need to do the following:
-Start up the game.
-When it prompts you to update, select Cancel.
-Go through the menus to select challenge mode (select the correct storage device).
-Once in challenge mode, go to Bruce Wayne.
-There will be a message telling you about how your score won't be saved or posted to the leaderboards. Keep going.
-Complete any ranked map (predator or combat) as Bruce Wayne (doesn't matter if you get 3 medals or not, assuming you've already got all 72) and the achievement should unlock.
I just got this achievement yesterday with this method (because it's still bugged), so I can confirm that this still works.