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