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