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