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