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