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.
Catch all horses for This Neigh Land.
Plow the fields 10 times.
Kill an NPC with a cow.
Use Pimp-A-Horse 20 times.
Set the amount of blood particles in settings to x5.
Come first in 10 races.
Herd a total of 50 NPCs to mass during the church herding side activity.
Collect all horseshoes.
Wield all weapons available in the game at least once.
Complete all quests for Salazar.
Complete all quests for the Spanish Inquisition.
Gain and then remove a maximum Wanted rating without dying and with no quest active.
Complete all quests for the Herbalist and the Doctor.
Kill 500 people.
Survive for 5 minutes at maximum Wanted rating.
Win 10 fights in the MMA side activity.
Collect 5000 gold pieces.
Complete all quests for the Knights of the Holy Grail.
Collect 20000 gold pieces.
Complete all quests for the Priest.
Collect 20 bodies during the body collecting side activity.
Kill 5 NPC in 5 seconds.
Complete all quests for the Loan Shark.
Block 10 attacks in 60 seconds.
Complete the first quest.
Successfully complete the Halloween event.