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