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