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