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