Here is the full list of all 30 Keyhole Spy: Frozen Hotties achievements.
Complete 15 puzzle with Marta
Complete 15 puzzle with Erika
Complete 15 puzzle with Ingrid
Complete 15 puzzle with Carolina
Complete 15 puzzle with Viveka
Complete 15 puzzle with Astrid
Win playing as Marta
Win playing as Erika
Win playing as Ingrid
Win playing as Carolina
Win playing as Viveka
Win playing as Astrid
Unfreeze Marta
Unfreeze Erika
Unfreeze Ingrid
Complete 15 puzzle with Gerda
Win playing as Gerda
Unfreeze Carolina
Unfreeze Viveka
Unfreeze Astrid
Unfreeze Gerda
Complete 15 puzzle with Elsa
Win playing as Elsa
Unfreeze Elsa
Complete 15 puzzle with Christina
Win, playing for Christina
Unfreeze Christina
Complete 15 puzzle with Hanna
Win, playing for Hanna
Unfreeze Hanna!