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