steam achievement bug on 1.0 release

Zone 45 "dodger" achievement not obtainable.

I have destroy eye tower multiple times (without being hit by eye or troops with at flying balloon and also a catapult),
am i missing something? unless i am reading this achievement wrong i think this must be a bug.
got the achievement :)

It seem's the achievement description is very miss leading. It is not destroying the tower without being hit, but seems to be destroying the tower without hitting a key (eg auto machine).

That's how i managed to get it.