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