Here is the full list of all 38 Hard West 2 achievements.
Completed all world map side objectives in Chapter 3.
Collected every card in the game.
Maxed out loyalty with Laughing Deer.
Maxed out loyalty with Lazarus.
Completed all world map side objectives in Chapter 1.
Finish "Frostbitten in Calla Calla" in no more than 10 turns with all objectives completed.
Completed a mission using only Shotguns.
Completed a mission using only Melee weapons.
Completed a mission using only Rifles.
Finish "Blasting Out" in no more than 8 turns with all objectives completed.
Finish "Fooling The Hangman" in no more than 4 turns with all objectives completed.
Finish "Daredevils" in no more than 8 turns with all objectives completed.
Finished the game on the Easy difficulty.
Finished the game on the Hard difficulty.
Finished the game on the Nightmare+ difficulty.
Finish "One Last Ride" in no more than 12 rounds with all objectives completed.
Form sets of Full House with 4 posse at the same time.
Form sets of Royal Flush with 4 posse at the same time.
Form sets of Straight with 4 posse at the same time.
Finish "The Great Train Heist" in no more than 10 turns with all objectives completed.
Killed 666 enemies.
Maxed out loyalty with Clalish.
Finish "Wanted: Lady Shrike" in no more than 15 turns with all objectives completed.
Finish "A Plague Upon This Land" in no more than 12 rounds with all objectives completed.
Finish "3:10 To Heaven" in no more than 1 round with all objectives completed.
Finish "Riftwalkers" in no more than 10 turns with all objectives completed.
Maxed out loyalty with Flynn.
Killed 80 Revenants.
Killed 50 Shadow Dancers.
Finish "O'Kane Farm" in no more than 8 turns with all objectives completed.
Finish "Flynn's Vision" in no more than 10 turns with all objectives completed.
Killed 100 Bandits.
Completed a mission using only Handguns.
Maxed out loyalty with Old Man Bill.
Killed 60 Hellspawns.
Visited every location in all Chapters.
Finished the game on the Normal difficulty.
Finished the game on the Nightmare difficulty.