Here is the full list of all 50 Last Will achievements.
Complete the office.
Complete the greenhouse.
Completed all four episodes within the time limit.
Complete a full run of episode 4 within the time limit.
Complete the fourth episode with over 30 minutes to spare.
Complete the third episode with over 30 minutes to spare.
Complete a full run of episode 3 within the time limit.
Complete the storage cellars.
Complete the chapel.
Unlock a hundred doors.
Complete a full run of the Chaos Gauntlet within the time limit.
Complete the Chaos Gauntlet with over 30 minutes to spare.
Reject the will and your inheritance.
Deliberately take out the entire mansion, and whatever may be lost with it.
Become the professor of the Gladsbury Estate.
Watch the prologue.
Open 50 doors.
Ensure no drawer, panel or door is left open in a successful multiplayer game.
Complete the study parlor.
Complete the game room.
Complete the dining hall.
Witness another player complete the transfer.
Complete the laboratory.
Complete the observatory.
Complete the south garret.
Complete the gallery.
Complete the isolated study.
Complete the conservatory.
Complete the workshop.
Complete the pantry.
Complete the master bedroom.
Complete a full run of episode 2 within the time limit.
Complete the second episode with over 30 minutes to spare.
Complete the old tower.
Complete the archives.
Complete the wine cellar.
Complete the darkroom.
Complete the bunker room.
Listen to your first audio recording.
Complete a full run of episode 1 within the time limit.
Complete the first episode with over 30 minutes to spare.
Complete the guest wing.
Complete the library.
Complete the passageway.
Complete the chess room.
Open your first door in the mansion.
Complete the entrance hall.
Enter the mansion with a full team of four players.
Complete any act with a full team in under 40 minutes.
Complete the transfer chamber.