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 the main story line.
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.
Catch all horses for This Neigh Land.
Wield all weapons available in the game at least once.
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.
Complete all quests for the Spanish Inquisition.
Herd a total of 50 NPCs to mass during the church herding side activity.
Kill 500 people.
Kill an NPC with a cow.
Complete all quests for Salazar.
Use Pimp-A-Horse 20 times.
Come first in 10 races.
Collect all horseshoes.
Collect 5000 gold pieces.
Win 10 fights in the MMA side activity.
Complete all quests for the Loan Shark.
Collect 20000 gold pieces.
Block 10 attacks in 60 seconds.
Complete all quests for the Priest.
Complete all quests for the Knights of the Holy Grail.
Plow the fields 10 times.
Kill 5 NPC in 5 seconds.
Collect 20 bodies during the body collecting side activity.
Set the amount of blood particles in settings to x5.
Complete the first quest.
Successfully complete the Halloween event.