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