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