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