true sparrow
The description on this achievement is garbage. Finished R1A1 by clearing the 1st room, then firing off all weapons (at the f-ing wall) so as to not have any temptation to fire them at enemies... didn't get it.
Finished the mission without firing a single shot, and got the achievement.
I shudder to think what other differences there are between the code and what they've f'd up with the achievements for other completionists out there.
As always, bugs are a dime-a-dozen with this game.
Never change, 10 chambers. 😦
fast kite