Just loaded up a save and had another go at the very end and it gave it to me, I knew I hadn't accidentally used a single vita-chamber. Not sure why it didn't take the first time. Some sort of glitch I guess.

Since I had no takers here on meeting up and playing over the weekend, but still felt like playing something and yet not wanting to start anything new, I decided to load up an audiobook on my iPod (now that I am not worried about missing story details) and set out to mindlessly beat BS2 on hard. Already in Siren's Alley. Since it is the lone single player achievement I don't have for the game, it seems a shame just to let it be. Especially when I was complaining about some aspects of the game being too easy on normal (Big Daddies and Big Sisters are still cake, but groups of Splicers are a nightmare). I would have sought the challenge of getting every achievement for the game, but there are all those stupid multi-player ones. I gave the multi-player an honest chance, but never could get myself to enjoy it.