probably over 100 tries on this but I cant justify wasting any more time on this
1 time actually fully finished the mission even with zero damage but because 1 civilian died to some random gas tank (??? didn't even shoot it, what even is that, not a door tripwire) I got an F and didn't get the achievement
1 time killed all but the flowerman and then accidentally pressed reload instead of bandage and bled out
probably 10 times died to BS on the stairs or aimbot flick across the fourth floor
nevermind even the 1ms reaction time AI, nevermind them being able to running headshot you from 50 m away while running sideways, nevermind the fourth floor stairs, nevermind the actual design of the fourth floor and how you'll die to some guy shooting you between a table and the asshole of a statue of a lion
the fact that you can actually complete the whole level WITHOUT TAKING DAMAGE, defuse the final guy, and still not get the achievement because some random gas tank went off and killed some civilian is regarded
all around just a generally dogshit mission & achievement in what otherwise is a good game