Here is the full list of all 38 Hard West 2 achievements.
Finished the game on the Normal difficulty.
Finished the game on the Nightmare difficulty.
Collected every card in the game.
Visited every location in all Chapters.
Completed all world map side objectives in Chapter 3.
Completed all world map side objectives in Chapter 1.
Maxed out loyalty with Flynn.
Maxed out loyalty with Old Man Bill.
Maxed out loyalty with Clalish.
Killed 60 Hellspawns.
Finished the game on the Hard difficulty.
Finished the game on the Nightmare+ difficulty.
Finished the game on the Easy 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 Laughing Deer.
Finish "Wanted: Lady Shrike" in no more than 15 turns with all objectives completed.
Finish "Riftwalkers" in no more than 10 turns with all objectives completed.
Finish "A Plague Upon This Land" in no more than 12 rounds with all objectives completed.
Maxed out loyalty with Lazarus.
Completed a mission using only Shotguns.
Completed a mission using only Melee weapons.
Completed a mission using only Rifles.
Finish "3:10 To Heaven" in no more than 1 round with all objectives completed.
Completed a mission using only Handguns.
Killed 80 Revenants.
Killed 50 Shadow Dancers.
Finish "Flynn's Vision" in no more than 10 turns with all objectives completed.
Finish "Frostbitten in Calla Calla" 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.
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.