Here is the full list of all 30 The Dark Pictures Anthology: Man of Medan achievements.
Finished the Shared Story
Maxed Brad and Alex's Relationship
Found all Secrets!
Found all of the black framed Pictures
Found all Pictures
Unlocked Julia's Spoilt Trait
Maxed Conrad and Fliss's Relationship
Only the women survived!
Only the men survived!
Unlocked Fliss's Arrogant Trait
Chose all of the Heart decisions
Found all of the white framed Pictures
Opened the window without making noise
Julia accepted Alex's proposal
Conrad successfully flirted with Fliss
No-one survived!
Everybody survived!
Calmed Junior down
Revealed the name of the ship
Completed the Solo Story
Chose all of the Head decisions
Unlocked Alex's Aggressive Trait
Unlocked Conrad's Humorous Trait
Completed 10 QTEs in succession
Beat the Training Dummy
Finished Movie Night
Found 25 Secrets!
Maxed Alex and Julia's Relationship
Conrad successfully escaped on the speedboat
Unlocked Brad's Envious Trait