No missable achievements (plus 21 unknown)
Sign in with Steam or Xbox to track your progress, and:
Complete the prologue.
Sell the ring.
Complete episode 1.
Unlock the hints system.
Complete episode 2.
Complete episode 3.
Hit the “kill kitty” button 20 times.
Beat the puzzle of the Sci-Fi Con sign without the bum’s help.
Complete episode 4.
Complete episode 5.
Complete episode 6.
Feed the Horsemen.
Beat the whole game.
Tell Bogs the password.
You made a complete scarecrow.
Feed the pigeons three times.
You didn’t fail any question in HAL’s game.
Beat the game without using the hints system.
Beat the final conversation choosing only the correct answers.
Beat the puzzle of the drawers and the books on your first try.
Beat the hot plate puzzle on your first try.