Here is the full list of all 38 Hard West 2 achievements.
Finish "3:10 To Heaven" in no more than 1 round with all objectives completed.
Maxed out loyalty with Lazarus.
Finish "Riftwalkers" in no more than 10 turns with all objectives completed.
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.
Completed a mission using only Melee weapons.
Completed a mission using only Shotguns.
Completed a mission using only Rifles.
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.
Killed 60 Hellspawns.
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.
Killed 666 enemies.
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 Flynn.
Killed 50 Shadow Dancers.
Maxed out loyalty with Clalish.
Finish "A Plague Upon This Land" in no more than 12 rounds with all objectives completed.
Killed 80 Revenants.
Completed all world map side objectives in Chapter 1.
Finish "O'Kane Farm" in no more than 8 turns with all objectives completed.
Killed 100 Bandits.
Finish "Daredevils" in no more than 8 turns with all objectives completed.
Form sets of Full House with 4 posse at the same time.
Maxed out loyalty with Old Man Bill.
Maxed out loyalty with Laughing Deer.
Finish "Wanted: Lady Shrike" in no more than 15 turns with all objectives completed.
Finish "One Last Ride" in no more than 12 rounds with all objectives completed.
Finished the game on the Nightmare+ difficulty.
Collected every card in the game.
Visited every location in all Chapters.
Finished the game on the Nightmare difficulty.