
You can, if you wish complete a humorous optional quest before the main quest line begins. Obviously you must choose the former to join the brotherhood, while choosing the latter will activate an alternative quest to kill the Dark Brotherhood guild members and so make all of the achievements unavailable. Remember that all of the Dark Brotherhood achievements are potentially missable, this is because you will be given a choice during the first primary quest to either kill three innocent people, or turn on a Dark Brotherhood member and destroy the guild. Depending on your decisions, there may be a few optional side-quests available, but they are not necessary for any achievements.

The Dark Brotherhood has '13' primary quests, the completion of which will unlock the '3' associated achievements. If the player joins the Brotherhood after this, he has some unique lines based on if they helped or hindered him, which is a nice touch from Bethesda.As a member of the Dark Brotherhood you will gain access to many advantages, these include: exclusive access to a certain Word Wall, various new useful armours, the most powerful dagger in the game, the ability to recruit Dark Brotherhood followers, a unique immortal horse named 'Shadowmere', and access to new merchants and trainers.

If instead, the player turns him into a nearby guard, he will pitch a fit off-screen, and in his rage will slaughter the farmer and his wife. If they choose to help him and get the nearby farmer to fix the wheel, he will be eternally grateful. The player can find the jester Cicero on a quest to get his dear mother to her final resting place, but he has had a wagon wheel break in transit. RELATED: Skyrim: 5 Reason It's The Best Elder Scrolls Game (& 5 It's Morrowind)

If it is started after joining, it will just cause some of the options to disappear but will add some different lines as Cicero realizes the player is a sibling. An optional quest taking place before the player is even initiated into Skyrim's Dark Brotherhood is Delayed Burial, though it can still be completed during the first two quests in the series.
