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