Here is the full list of all 38 Hard West 2 achievements.
Killed 60 Hellspawns.
Collected every card in the game.
Maxed out loyalty with Lazarus.
Completed a mission using only Shotguns.
Maxed out loyalty with Laughing Deer.
Completed a mission using only Rifles.
Killed 666 enemies.
Completed a mission using only Melee weapons.
Completed a mission using only Handguns.
Finished the game on the Easy difficulty.
Finished the game on the Hard difficulty.
Finished the game on the Nightmare+ difficulty.
Completed all world map side objectives in Chapter 3.
Finished the game on the Normal 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.
Maxed out loyalty with Old Man Bill.
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 50 Shadow Dancers.
Finish "3:10 To Heaven" in no more than 1 round with all objectives completed.
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 "Riftwalkers" in no more than 10 turns with all objectives completed.
Maxed out loyalty with Clalish.
Killed 80 Revenants.
Maxed out loyalty with Flynn.
Completed all world map side objectives in Chapter 1.
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 "Frostbitten in Calla Calla" in no more than 10 turns with all objectives completed.
Killed 100 Bandits.
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.
Visited every location in all Chapters.