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