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