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