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