Here is the full list of all 31 MADiSON achievements.
Finish the game under 2.5 hrs.
Finish the game under 6 hrs.
Complete the game.
Blind Blue Knees five times.
Let Blue Knees kill you.
Find every blue collectible.
Find every collectible in the game.
Find every red collectible.
Make the four virgins cry.
Find Elizabeth's diary lost page.
Play the "Do not listen" tape.
Complete the shelves section under 5 minutes.
Get back to the main house a second time.
Survive through the entire Cathedral section.
Complete the tunnels section under 3 minutes.
Take 100 photos.
Let Hans kill you.
Find a collectible.
Take 50 photos.
Reach Luca's storage limit.
Get back to the main house for the first time.
Break the shovel.
Store an item for the very first time.
Find the hidden message on the mirror.
Take 500 photos.
Survive through the entire Blue Knees section.
Complete the mausoleum section under 5 minutes.
Complete the game taking 75 or fewer pictures.
Complete the game taking 40 or fewer pictures.
Complete the game in hard mode or higher.
Unlock every achievement of the game.