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