There are myriad reasons why a game like Fallout 4 is so good, from its sheer depth to its flexibility. That latter point ties into modding, which Bethesda is happy to not just let fans dive into, but is proud to support. As one reddit user has discovered, though, there is one major caveat to be aware of if you want to use FO4 mods: no achievements.
In his post, reddit user HakfDuckHalfMan notes that games in FO4 that have enabled mods are treated as completely separate from ordinary ones. An example given: If your username is John, the next time you save a game with a mod enabled, a "John [Modded]" saved game will result. From that point on, the saved game is going to be flagged as having modding enabled, which in turn will prevent achievements from being earned.
While this information originally came through a third-party, an image, pictured above, has since surfaced that backs the information up.
The problem here should be obvious: not all mods are designed to make a game easier. In fact, very few mods are actually designed for that; instead, they're designed to make the game better, adding features that the game developer didn't, or didn't want to. Of course, mods can also adjust graphics, and if that's all one does, many believe it shouldn't disable achievements.
Fallout 4 is far from being the first game to suffer this kind of limitation. Sid Meier's Civilization V has the exact same design, which means any achievement hunter isn't going to be taking advantage of even the simplest (but useful) mods.
The moral of this story? If you're looking to clear all of your FO4 achievements, you might want to get a move on before the modding capabilities hit the public version of the game, as choosing between mods and achievements might be quite difficult for some. In the meantime, let's hope that Bethesda sees the outcry and decides to pull back on this limitation.