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