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