Here is the full list of all 32 Curse of the Assassin achievements.
Fool the mighty Coca Rabixa
Hear the 'Endecha de la Sangre'
Find all the artwork in Curse of the Assassin
Successfully use your hunting skills
Complete the gamebook in Classic Mode
Return a ring to the rightful owners
Recruit all members of the Death Hawks
Complete the gamebook in Adventurer Mode
Defeat the leader of the Hombre Peces
Find the best armour in the gamebook
Become possessed by an ultimate boss
Find the best weapon in the gamebook
Laugh hysterically with Esplandian
Steal a sheep
Purify the water in a well
Meet all the creatures from folklore and legend
Meet a Sanziana and receive a special gift
Rescue two people very close to you
Visit all the taverns in the story
Find out the location of the Jewel of Orlandes
Successfully report back to the Head Gaoler
Complete the gamebook in Casual Mode
Return a cry three times when out at sea
Discover a dastardly plot
Receive a special blessing
Roll 3 ones in one dice roll
Save a companion from some watery rapids
Roll 3 sixes in one roll
Offer your life for another
Find out the meaning behind the 'breadbasket of Orlandes'
Receive a threatening letter
Learn the secrets of Coyote Lore