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