Mostly Flesh and Steel
Finish the game without purchasing any supernatural powers or enhancements, besides Blink
I've just finished the game without purchasing anything besides Blink and didn't get the achievement. Maybe because I "bought" the Blink's upgrade (Blink II) ?
Or is it anything else that I should have been aware of ?
Best Answer
Someone has reported (Reddit - /r/dishonored) that getting Blink II will indeed stop the Mostly Flesh and Steel achievement from unlocking.
Another report (also from /r/dishonored).
Also, from the "Notes on Stealth Detection, Chaos, and Trophies/Achievements" post in the Bethesda forums by Gstaff, an admin and 'Global Community Lead':