Silver-Tongued Devil

Silver-Tongued Devil is an achievement earned by winning 50 Speech challenges.

Tips for Silver-Tongued Devil
Note: The following tips will work on all three versions of fallout (XBOX 360, Sony PS3, and PC):

These tips are mainly for those people who have left Silver-Tongued Devil as their last trophy/achievement, and those who have yet to start the game or haven't done many quests.

For those just starting the game, it is recommended that the player put points into Speech and Charisma to speed the process. Keep in mind that much of the work on getting Silver Tongued Devil will be finished if the game is played thoroughly, and in fact, along with other trophies/achievements of this type, will likely be complete if the player opts to play all of the side quests and to explore the world outside of the main storyline.

However, if necessary, the following quests and/or locations present speech challenges that will aid in gaining the trophy/achievement:

Vault 101 There are not many speech challenges in the vault, but be sure to save Amata before taking the G.O.A.T. After escaping Vault 101, be sure to get the speech challenge from Silver who lives in small ranch between the Vault and and Springvale School. Even if you're not really interested in the money she gives you, you could always execute her afterwards.

Megaton There are several NPC's in Megaton that present speech challenges: Lucas Simms, Jericho, Doc Church, Mr Burke, Gob, Colin Moriarty, Leo Stahl (the player will need to win Doc Church's speech challenge before she can do this one). It is possible to lie to Moira Brown multiple times during The Wasteland Survival Guide quest, though much less loot and perhaps a lost perk will be the result if too many lies are told. The player should also take care not to talk Moira out of finishing the guide.

Blood Ties Quest This quest is fairly quick and has plenty of speech challenges. After getting the quest from Lucy West the player can get a speech challenge from Evan King in Arefu. There are also several speech challenges in Meresti Metro Station.

Tenpenny Tower Quest This is a gold mine for those trying to get this trophy/achievement. Tenpenny Tower has many NPC's offering speech challenges. No matter your choice (to help or kill the ghouls) you can get a speech challenge from Gustavo, as well as the five people on Tenpenny's list.

Oasis There are a handful of speech challenges when doing the Oasis quest.

Republic of Dave There are three speech challenges when doing the Election Day quest.

Paradise Falls The Rescue from Paradise quest has few speech challenges: 1. Try to buy your way into Paradise Falls at the front gate; 2. Persuade Eulogy Jones to sell the children to you for fewer bottle caps; 3. Convince Bumble in Little Lamplight to leave the cave and go with the Child Slaver Note: You will need to ask Eulogy Jones to get this quest.

Rivet City The Superhuman Gambit Note: Using Black Widow or Lady killer may prevent the player from getting a few of the challenges on this dialogue tree.

Girdershade The Nuka Cola Challenge The player does not need to complete this quest to get all of the speech challenges.

Jefferson Memorial Take it Back!, the last quest of the game, offers two speech challenges when you meet Colonel Autumn for the final showdown at the end.

Underworld You Gotta Shoot 'Em in the Head has many speech checks for players wanting less violent ways to accomplish the quest, both in convincing the targets to hand over the keys, and in lying to Mister Crowley about their fates. First, go to Dave. He will have a option where you can do a speech check to find out if he knew Crowley. Then After that you can do another speech check when you tell him that Crowley's alive. Then there will be an option to find out more about Fort Constantine. Then you can offer to take the key without killing him. All in all there are four speech checks with Dave. Then go to Dukov. There are two speech checks with Dukov. One to find out where Fort Constantine is, and another to get his key. (The speech check to get his key is quite hard. With a 100 there is only a 68% chance of success.  Remember to save beforehand if you really want to get this speech success). Then go to Ted Strayer. There is only one speech success, which will give you his key. Now go to Tenpenny Towers. Talk to Allistair Tenpenny and ask him about Crowley. He will be somewhat unsurprised to find out Crowley is still alive. He will give you the option to kill Crowley for him. There will be a speech check here to get better pay.

And finally, the player can choose to go the bad karma route for the Tranquility Lane to get a few speech challenges.

Less 'Honorable' Methods
First Option: Go to Big Town and speak to Bittercup, who is usually sleeping in the Common House. When you first speak with her, be agreeable and tell her that no one understands you either. Eventually, Bittercup mentions that she dated Pappy. Then speak to Pappy. The easy speech check "I heard you came here with Bittercup" dialogue option will never disappear, giving the player a chance to earn unlimited experience and an easy way to earn the achievement. This is no longer possible on the PS3 version as the Pappy exploit has been patched and removed, nor does it work on the latest patched XBOX 360 version.

Second Option: First, travel to Little Lamplight (see link for exact location). There is a young girl in the city named Knock Knock, sister of Knick Knack (owner of the souvenir shop), who can mostly be found in the Great Chamber or at the Fungus Pool.

Talk to her, and she will try to tell a joke. Play along, and after hearing it out she will ask the player if it was good. If the player succeeds in lying to her, she has won a speech challenge. Ending the conversation allows the player to repeat it an unlimited number of times. Still works on patched XBOX 360 and PS3 versions.