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