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