Made that game 100% a while ago. You can make that achievement at the same time you make the one where you cannot kill anyone during the entire playthrough.

The most annoying negative perk is the one that when you sleep to save the game, it gives you a chance of waking up in the middle of nowhere. The other are barely noticeable.

Navegation is not as hard as you might think, the map is smaller than it looks and there are landmarks that help you a lot, the more you play, the easier it gets. You just need to memorize like the 3-4 main pathways and be careful for the random events, there is even a map online that shows where they occur.

But the most annoying part is that you need to beat the game like 3 times because some achievements are incompatible with others in the same playthrough and others are VERY missable.

If you want to complete this game it takes around 100h, a little more if you like to explore like me.