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