Here is the full list of all 29 Rustler achievements.
The base game contains 28 achievements, and there is 1 DLC pack containing 1 achievements.
Plow the fields 10 times.
Complete 100% of the game, including all quests, side activities, and obtaining every other achievement.
Come first in 10 races.
Catch all horses for This Neigh Land.
Complete 100% of the game without dying nor getting caught even once.
Use Pimp-A-Horse 20 times.
Collect 20 bodies during the body collecting side activity.
Herd a total of 50 NPCs to mass during the church herding side activity.
Kill 500 people.
Gain and then remove a maximum Wanted rating without dying and with no quest active.
Survive for 5 minutes at maximum Wanted rating.
Complete all quests for the Herbalist and the Doctor.
Wield all weapons available in the game at least once.
Complete all quests for Salazar.
Collect all horseshoes.
Complete all quests for the Spanish Inquisition.
Kill an NPC with a cow.
Complete the main story line.
Collect 20000 gold pieces.
Collect 5000 gold pieces.
Set the amount of blood particles in settings to x5.
Complete all quests for the Loan Shark.
Complete all quests for the Priest.
Complete all quests for the Knights of the Holy Grail.
Kill 5 NPC in 5 seconds.
Block 10 attacks in 60 seconds.
Win 10 fights in the MMA side activity.
Complete the first quest.
Successfully complete the Halloween event.