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