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