Very Sneaky feat

[Red Minjo]

I'm playing the Life challenge for the first time and see that feat revealed on the achievements list. From what I've seen of the challenge so far, I'm not sure I get how to do it without just being lucky. Like, I understand turning off AutoFight and force-abandoning the trimps, but beyond that. Do I have to drop agility by a bunch to react to an enemy being living? Not touch agility and just study the pattern and hope I can get the timing right?

[Huillam]

In a given zone the pattern appears to repeat over time. It has to be possible to take advantage of that (and of a lot of save scumming).
And liquification[trimps.fandom.com] is apparently safe (probably not if the first cell of a zone is a living enemy). Although that one is more of a long term solution.

[Gra̶bz]

You can use hotkeys (F to fight, M to go to maps and back) to react instead of clicking the buttons with your mouse cursor.

[Red Minjo]

Export/import and hotkeys instead of mouse seems like a very good combo. Testing on a lower level area, even just the hotkeys alone might do it, without changing agility for reaction time reasons. Very good.

[archmag]

At the very beginning stop at the first cell and check if it is possible to go through the whole level only killing undead cells. Some configurations have cells that are always alive so there is no way to get this achievement on that level.

Another trick is to wait until the configuration is easy. Some of them start small and die out leaving the whole field empty so you can safely pass through it until they respawn at a certain initial place few turns later. Some are even better and are localized so they after you pass though a small dangerous zone you are safe to progress further. But some are expanding heavily and fill almost all field, those are better ignored. So again, turn off autoattack, stop at the first cell and wait through the whole cycle to see what type of pattern you got. Choose the one that is easier, ignore those that are difficult (but make sure you still have maxed stacks when leaving difficult ones). Make sure you farm 200% attack bonus from maps so that you one-shot enemies and progress quickly when you need to progress.

It's not that difficult as long as you wait for a good easy pattern and use F and double M with Auto-attack off.

[Red Minjo]

It was much easier to get than I had expected. After I got to the appropriate Zone I only failed once. Thanks for the advice.