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