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