Here is the full list of all 20 Forty Thieves Solitaire Collection achievements.
Win a game of "Ali Baba"
Win a game of "Busy Aces"
Win a game of "Deuces"
Win a game of "Double Rail"
Win a game of "Forty Thieves"
Win a game of "Indian"
Win a game of "Breakwater"
Win a game of "Lady Palk"
Win a game of "Limited"
Win a game of "Midshipman"
Win a game of "Miss Milligan"
Win a game of "Parliament"
Win a game of "Rank and File"
Win a game of "Red and Black"
Win a game of "Single Rail"
Win a game of "Squadron"
Win a game of "Swiss Patience"
Win a game of "The Spark"
Win a game of "Thieves of Egypt"
Win a game of "Waning Moon"