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