Go to the northeast area of the game (Great Plains) once you reach it later in the game. There will be only one pack of buffalos at any given time. Kill all the buffalo in the pack to get the "Manifest Destiny" achievement.
Easy "Most Wanted" achievement
Note: The entire process takes place while the player is under the palace with the following glitch. Travel to Escalera. There is a palace at the top surrounded by cement walls. Enter through the doors. However, only one set of the doors work. Enter the palace, and go left. You will see a potted plant in a corner next to a bookcase. Get behind it by either jumping over it or walking behind it. Face the bookshelf and crouch. You should fall through the floor; if not, spin in circles while crouched until it happens. If you end up in some random room with no doors or windows, you will be stuck and must kill yourself to be freed. Once under the palace, you can shoot through the walls, but no one can shoot back. To leave this area, just walk out of any of the walls. Get a bounty of $1,000, and maintain the public enemy pursuit for ten minutes of real time. Make sure the Mexican army stays on you for that period of time. Wait for the pursuit to dissipate. Let the pursuit die out to get the "Most Wanted" achievement.
Easy "Six Years In The Making" achievement ("Undead Nightmare" DLC)
Sasquatches can be found in Tall Trees, and their areas will be marked by starting the "The Birth Of The Conservation Movement" Stranger mission to the south of Tall Trees.
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
High Roller (10 points): Win over 2000 chips in a hand of Poker.No Dice (10 points): Complete a game of Liar's Dice without losing a single die.What About Hand Grenades? (10 points): Get a ringer in a game of Horseshoes.Austin Overpowered (25 points): Complete Twin Rocks, Pike's Basin, and Gaptooth Breach Hideouts in Single Player.Evil Spirits (25 points): Complete Tumbleweed and Tesoro Azul Hideouts in Single Player.Instinto Asesino (25 points): Complete Fort Mercer and Nosalida Hideouts in Single Player.Fightin' Around the World (5 points): Knock someone out in melee in every saloon in the game in Single Player.Strange Things are Afoot (10 points): Complete a task for a Stranger.People are Still Strange (25 points): Complete 15 tasks for Strangers.Buckin' Awesome (10 points): Break the Kentucky Saddler, the American Standardbred, and the Hungarian Half-bred.Clemency Pays (10 points): Capture a bounty alive.Exquisite Taste (10 points): Purchase a rare weapon from a gunsmith.Bearly Legal (5 points): Kill and skin 18 grizzly bears.He Cleans Up Well! (10 points): Obtain the Elegant Suit.More than a Fistful (10 points): Earn $10,000 in Single Player.Frontiersman (20 points): Obtain Legendary rank in any Single Player Ambient Challenge.The Gunslinger (5 points): Score a headshot on any enemy using Expert targeting mode.Man of Honor / Chivalry's Dead (25 points): Attain highest Fame rank and either highest Honor rank or lowest Honor rank.Gold Medal (25 points): Earn a Gold Medal Rank for a combat mission in Single Player.On the Trail of de Vaca (10 points): Uncover every location on the map in Single Player.Friends in High Places (10 points): Use a pardon letter with more than $5000 bounty in Single Player.Redeemed (100 points): Attain 100% in the Single Player Game Completion stat.Mowing Them Down (20 points): Kill 500 enemies with a mounted weapon in any game mode.In a Hail of Bullets (20 points): Kill 500 enemies with any pistol or revolver in any game mode.Long Arm of Marston (20 points): Kill 500 enemies with any rifle, repeater, or shotgun in any game mode.Bullseye (20 points): Get 250 headshots in any game mode.Unnatural Selection (20 points): Kill one of every animal species in the game in any game mode.Have Gun Will Travel (20 points): Complete all Hideouts in a single public Free Roam session.Slow on the Draw (10 points): Get 10 assists in a single Hideout in a public Free Roam session.Hit the Trail (10 points): Get from Blackwater to Escalera before sundown in a public Free Roam session.Posse Up! (10 points): Create a posse and get the maximum number of members.The Quick and Everyone Else... (20 points): Be the top scoring player in any three consecutive FFA games in public matches.How the West Was Won (20 points): Reach the top rank for multiplayer experience.Go Team! (20 points): Be on the winning team for four consecutive victories in any team based game in public matches.Most Wanted (10 points): Become a Public Enemy for 10 minutes and escape alive in a public Free Roam session.Red Dead Rockstar (10 points): Kill a Rockstar or someone with this achievement in a public multiplayer match.
Additionally, there are 12 secret achievements:
That Government Boy (10 points): Complete "Exodus in America".Land of Opportunity (30 points): Complete "The Assault on Fort Mercer".Sons of Mexico (40 points): Complete "The Gates of El Presidio".No More Fancy Words (20 points): Complete "An Appointed Time".A Savage Soul (10 points): Complete "At Home with Dutch".The Benefits of Civilization (90 points): Complete "And the Truth Will Set You Free".Into the Sunset (100 points): Complete "The Last Enemy That Shall Be Destroyed".Nurture or Nature? (50 points): Complete "Remember My Family".Dastardly (5 points): Place a hogtied woman on the train tracks, and witness her death by train.Spurred to Victory (10 points): Complete 20 story missions without switching to a new horse at a hitching post.Heading South on a White Bronco (5 points): Evade the US Marshals while riding the Hungarian Half-Bred horse in Single Player.Manifest Destiny (5 points): Kill the last buffalo in the Great Plains in Single Player.
The following achievements require the "Outlaws To The End" bonus downloadable content:
Well done (5 points): Complete a Co-Op mission.Have posse, will travel (15 points): Complete all Co-Op missions.2 guys, 1 Coop (10 points): Complete a Co-Op mission with just 2 people.Stake a claim (5 points): Gold medal any Co-Op mission.Struck gold (10 points): Gold medal all Co-Ops missions.Friends indeed (5 points): Complete a Co-Op mission without anyone dying.You rule! (15 points): Complete all Advanced Co-Op missions.The mother lode (20 points): Gold medal all Advanced Co-Op missions.Dodge this (10 points): Achieve a kill chain of 10 or more in any Advanced Co-Op mission.Bulletproof (5 points): Complete a Co-Op mission without dying.
The following achievements require the "Legends And Killers" bonus downloadable content:
Call it a Comeback! (10 points): Come back from a 2-0 deficit and win a Hold Your Own game.Who needs Deadeye? (10 points): Kill 3 or more players in a standoff or showdown.Stick and Move (10 points): Get 3 kills with knives or throwing knives in a single competitive match.Double bagger (10 points): Double capture 3 times in a single Gold Rush map.Headhunter (10 points): Kill 5 players via headshot in a single Shootout or Gang Shootout.Legendary (10 points): Reach level 50 and pass into Legend.Hail Mary (10 points): Get a kill greater than 35 yards with a Tomahawk.Axe Master (10 points): Complete all Tomahawk challenges in Single Player.Original Gunslinger (10 points): Get 25 Deadeye kills with Red.Reeeeal Good (10 points): Get 25 Dynamite kills with Pig Josh.
The following achievements require the "Liars And Cheats" bonus downloadable content:
Master Exploder (10 points): Complete the Explosive Rifle Single Player Challenge.Pa-Pa-Pa-Poker Ace (10 points): In a full Multiplayer Poker game, beat the table when blinds are at maximum.The Big Bluff (5 points): In a Multiplayer Poker game, win a hand by forcing someone with a better hand to fold.In A Van Down By The River (5 points): In a Multiplayer Poker game, win a hand on the last card when you were losing prior.Compulsive Liar (10 points): In a full Multiplayer Liar's Dice game, win without losing a single die.Good Call (5 points): In a single Multiplayer Liar's Dice game, successfully make a spot-on call.One Die to Rule Them All (5 points): In a Multiplayer Liar's Dice game, win with only one die left.Triple Crown (10 points): Get first place in all races in any Grand Prix.Peacewalker (5 points): Finish a single race without getting shot or killed, and without shooting a bullet.From Glue to Mon Dieu! (5 points): During a Grand Prix, finish a race in first after placing last in the previous race.We Must Protect This House! (10 points): While on defense, do not allow the attacking team to capture any of their objectives.Avatar of Death (5 points): Successfully complete either round of a Stronghold map without dying.Legion of Boom (5 points): Get a triple kill while on the attacking team in Stronghold.Over 9001 (5 points): Attain over 9,001 points in a single Free Roam session.Put the Posse on a Pedestal (5 points): Attain over 50,000 posse points in a single Free Roam session.
The following achievements require the "Undead Nightmare" bonus downloadable content:
Spinning Plates (25 points): Have every territory saved at the same time during the Undead Nightmare.Zed's Dead, Baby (40 points): Attain 100% Game Completion statistic in Undead Nightmare.Mad Marston: The Trail Warrior (10 points): Attain Rank 5 in all Undead Nightmare Challenges.Smoke that Skinwagon (10 points): Make it to wave 15 in Undead Overrun Gametype in Multiplayer.Kingpin (10 points): Fight off 8 unique players during your time on top during Land Grab in Multiplayer Free Roam.
Additionally, there are seven secret achievements with the "Undead Nightmare" bonus downloadable content:
Six Years In The Making (10 points): Find and kill a sasquatch.The Downward Spiral (10 points): Complete 'Curious Tales from Blackwater, USA' Survivor mission.Judge A Man By The... (30 points): Complete 'Cure For Most of What Ails You' and 'Get Back in that Hole, Partner' Survivor missions.All's Right With the World (25 points): Complete 'On a Pale Horse'.The Superior Dance (10 points): Complete 'Mother Superior Blues' Survivor mission.Fan Service (10 points): Find and break a unicorn.Chupathingy (10 points): Find and kill a chupacabra.