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