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