Outward

Note: this achievement should be done in or near Cierzo. If you go into other regions such as the marsh or desert, it obviously won't snow. If you're confused where Cierzo is, it's your starting town.

This is a really simple achievement. Just keep an eye out for the weather as you play. When it snows, all you need to do is open your inventory, set up your tent, and sleep for a selected amount of time. You can be inside city walls for this to work as well, you don't need to be out in the wilds.

I specifically chose to sleep just outside the lighthouse, and I used a tent for this achievement. However, bedrolls also work. I did not set up a campfire or anything else, so it's clearly not needed for the achievement. If you don't have a tent or bedroll on hand, every general merchant in the game will at least one type. So you can get one fairly cheap.

Once you've passed the time and your character exits the tent, the achievement should pop.