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