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