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