There is exactly one achievement worth chasing in Frutiger Home, and it hides a small, easy-to-miss secret right at the start of the game. If you are the kind of player who boots up a walking-sim-style experience and immediately starts poking at every panel, you will probably find it fast. If you are like me and wander straight ahead without checking your corners, you might spend far longer than you would like to admit on a single button.
I put this together because the solution is genuinely tiny — one interaction, one menu, one arrow press — yet I managed to overlook it for longer than I care to say. Here is exactly what to do so you do not repeat my mistake.
Getting the Frutiger Evil Achievement
The whole achievement hinges on one screen you can very easily walk past. The moment you step out of the entrance elevator, do not head forward — turn to your left instead. Sitting against that side is a small screen, and it is fully interactable.
Walk up to it and interact. This opens a settings screen that lists out every function of the house. It is the kind of panel you could skim past without realizing it controls anything meaningful, which is precisely the trap I fell into.
Among those options is the sky color. To change it, press the down arrows on either side of it and keep cycling through the colors until you land on red. You do not need to confirm anything clever or hunt for a hidden toggle — the arrows do all the work, and hitting red is the finish line.

Once the sky turns red, that is it. Frutiger Evil pops, and you can enjoy your newly ominous red sky at your leisure.
What to Watch For
The only real pitfall here is direction. Because the entrance elevator naturally pushes you to move forward, it is tempting to head straight into the house and never glance left. I did exactly that, and the fix was sitting inches away the entire time. Before you explore anywhere else, make that left turn and check the screen — it takes a few seconds and saves a lot of pointless backtracking.
Beyond that, the color cycling is the only fiddly part: you are stepping through options rather than selecting red directly, so keep tapping the arrows until red appears. No coordinates, no puzzles, no prerequisites — just that one panel off to the left.
Conclusion
Honestly, this one embarrassed me, and I suspect it has caught a few other players the same way. Turn left, find the screen, cycle to red. That is the whole achievement — go grab it and move on.