"The Heat is On" was a lot harder than I expected
Honestly reminded me of Programmed Psychosis, but in a smaller package. The lobby is a very tricky area to clear, as are the two staircases and the vault itself, though none of them compare to the grand staircase in ANA. It is nice that the mission is so frontloaded: The first room usually has ~1/3rd of all the suspects, so you know how the mission will go fairly early. I did it with AI teammates who were ultimately kind of useless and I ended up soloing the whole thing.
Friendly reminder: The stab vest counts as armor! I actually beat it twice without the achievement popping before I realized my mistake. It took me about a week & 30ish attempts to get this (vs. 2 weeks & 75ish attempts for PP) but I could've done it much faster if it weren't for my mistake.
If Programmed Psychosis is absolutely wrecking you, maybe consider this challenge as a more approachable warmup to learn the mechanics you'll need.