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