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