Here is the full list of all 41 Pentiment achievements.
Convince Illuminata to give you the French book.
Get Lucky executed.
Examine 10 flowers.
Get Matilda executed.
Get Ottilia executed.
Get Ferenc executed.
Get Martin killed.
Get Hanna killed.
Get Guy killed.
Headbutt Werner.
Seduce Zdena.
Spin wool as fast as the ladies.
End Act I in the abbot's favor.
Have your hat stolen.
End Act I out of the abbot's favor.
Get Wojslav to let you into the cellar.
Convince Gernot to let you dig up the grave.
Tell Jacob Estler immaterial gossip.
Convince Jacob Estler to save Ottilia's home.
Solve Ferenc's cipher with the volvelle.
Finished Act 1.
Get knocked out.
Win everyone's money at Lansquenet.
Lose everything at Lansquenet.
Convince Endris to find his sweetheart.
Complain to Niko about your room.
Discover the imposter.
Get Aedoc his medicine.
Do your penance.
Shoot the deer.
Refuse to shoot at the deer.
Finished Act 2.
Cut enough cookies for everyone at the Christmas feast.
Get assistance climbing down the mine shaft.
Learn about Artemis and Apollo's frog plan.
Learn the mystery of the cats.
Finished Act 3.
Find the secret door to library.
Encourage Paul to draw.
Pet 5 animals.
Pass 5 dialogue checks.