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