How can I get the But How? achievement on the Slaughterhouse map? The achievement states
In the Slaughterhouse job, get the armoured truck to drop without shooting at the wires on which it is suspended.
Shooting the wires doesn't appear to make the truck fall, and I've held out for 3 waves with nothing happening.
This is very similar to this question but that question pertains to Payday: The Heist, and the accepted answer doesn't have the relevant information (although the other answer does). Unfortunately, I wouldnt feel right about adding an answer to that as this is for a different game, even if the technique appears to be the same.
Best Answer
To the best of my knowledge, it's achievable in the same way it was in Payday: The Heist, and you can find that information in this question.
Typically, if you don't do anything, the truck will fall bottom-first into the slaughterhouse and you will need to C4 its doors open; however, you need it to fall nose-first into slaughterhouse so you would need to shoot the wires to get the truck down (of course, you don't want to shoot the wires!)
Waiting at the start of the map for the convoy to appear down the ally
The truck being hit with its window shot out
If you do not shoot the truck's window, it will be pushed like this instead:
The truck being hit without its window shot out
Truck hanging nose first after its window was shot out. Notice that the objective is slightly different, as you need to get the truck down to continue the mission
However, if you don't shoot the truck window you can see the truck hangs with its bottom down (and you can just plant the C4 to blow it open, rather than needing to get it down at all!)
The truck hanging normally if the user didn't interfere