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