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