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