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