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