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