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