Here is the full list of all 38 Hard West 2 achievements.
Finished the game on the Nightmare+ difficulty.
Finished the game on the Normal difficulty.
Finished the game on the Nightmare difficulty.
Killed 60 Hellspawns.
Finished the game on the Hard difficulty.
Visited every location in all Chapters.
Collected every card in the game.
Maxed out loyalty with Lazarus.
Completed a mission using only Melee weapons.
Completed a mission using only Shotguns.
Killed 666 enemies.
Finished the game on the Easy difficulty.
Completed all world map side objectives in Chapter 3.
Finish "One Last Ride" in no more than 12 rounds with all objectives completed.
Form sets of Royal Flush with 4 posse at the same time.
Maxed out loyalty with Laughing Deer.
Maxed out loyalty with Flynn.
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.
Maxed out loyalty with Clalish.
Maxed out loyalty with Old Man Bill.
Form sets of Full House with 4 posse at the same time.
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.
Finish "Riftwalkers" in no more than 10 turns with all objectives completed.
Killed 80 Revenants.
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.
Completed all world map side objectives in Chapter 1.
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.