Don't disturb achievement? (terminus level)

[Chabibi]

I completed the game, and decided to go back through the game on purist to get the achievements I didn't get before.
One of them was 'Don't Disturb' on the Terminus hotel / upper floors, which I just can't seem to get.
I assume you can't kill anyone, given the description of it, and it seems to be that way as I can knock people out on the first section (or rather, subdue them) on the first part of the mission, where the first box is ticked, and the percentage done is around 50%.

I get through the second half not killing anyone, basically doing what I was before (finding a choke-point, throwing an object behind and subduing anyone who comes through the door to look). But for some reason this doesn't work for the second half.

Am I doing something wrong? Is it somewhat different for the second half, or is it just bugged?
I'm fine if it's bugged, but I've tried it many times and never yet got it. I've looked at youtube videos and they all show people being subdued. Anyone know?

[bean]

When I went for this challenge, I played through both parts of the level without getting spotted or touching them (not killing nor subduing). I'm pretty sure that's how it's meant to be since you need to have "clean hands", that worked for me anyway :)

[Chabibi]

It seems weird that it would say I've completed the first half of it with knocking people out. I would have thought that it would have said I haven't completed the first half if you weren't allowed to knock anyone out. I assumed 'clean hands' was referring to blood, or death.

[bean]

Maybe you've completed the first part without harming anyone previously, it saves progress towards certain challenges, but as I say, I got it fine without touching people.

[Chabibi]

I've never done the first part without knocking at least one person out, I know that. Usually about three to five. I would do it without knocing people out, but certaily not on purist. XD

[bean]

You should be able to get it following this http://store.steampowered.com

[Chabibi]

Can't. I've seen loads of videos of people trying to do it on other levels, but on purist it's impossible. :P Trying to jump through the window like that gets you instantly noticed.

[e]

just go through it on normal to unlock the challenge for the points multiplier and play it on purist for points

[icarus_falling669]

Im not getting credit for the Hall Pass Achievement in the Terminus Hotel. I somehow got credit for the second part, the Upper Floors, but even though Ive sneaked my way into every part of the ground floor, its not giving me credit. Anyone else with this problem?

[Chabibi]

Ircarus - it's (apparantly) not about sneaking into all parts of the building, but nobody seeing you, so I would guess no knocking people out, no people getting suspicious, and all that. I've not done that yet though, so I can't say for sure.