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