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.
Get a 2x multiplier.
Make your first combo.
Beat the game in Normal mode.
Beat the game in Hard mode.
Get 10 perfect hands in a chapter.
Earn 20 stars in a chapter.
Win 5000 gold in a single chapter.
Win 6000 gold in a single chapter.
Get a 5x multiplier.
Make a combo of 20 or higher.
Make a combo of 35 or higher.
Purchase all of the ballroom and costume upgrades.
Use all 3 cameo powerups in a single hand.
Fill up the fan with wildcards/jokers.
Save up 25000 gold without spending it.
Reach chapter 7, set in London.
Find the silver teapot.