Here is the full list of all 9 The Outlaw The Drunk The Whore achievements.
Get 3 in a row on the slot machine
Defeat the Devil at Poker (Good Ending)
Get to the Devil without the 4 Aces (Bad Ending)
Sink the ironclad U.S.S. Monitor
Kill the Rancher!
Sell a gold nugget to the Kooky Prospector
Rescue all 3 captives in a single playthrough
Allow the train to run over the girl, you monster!
Get all 30 antiques for the Olde Tyme museum