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