Here is the full list of all 17 Regency Solitaire achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Beat the game in Hard mode.
Beat the game in Normal mode.
Purchase all of the ballroom and costume upgrades.
Find the silver teapot.
Save up 25000 gold without spending it.
Get a 5x multiplier.
Make a combo of 35 or higher.
Make a combo of 20 or higher.
Use all 3 cameo powerups in a single hand.
Fill up the fan with wildcards/jokers.
Reach chapter 7, set in London.
Win 6000 gold in a single chapter.
Get 10 perfect hands in a chapter.
Win 5000 gold in a single chapter.
Earn 20 stars in a chapter.
Get a 2x multiplier.
Make your first combo.