Here is the full list of all 29 Marlow Briggs and the Mask of Death achievements worth 400 gamerscore.
Watch all credits
Complete the game on any difficulty
Defeat HellHound
Kill enemy with each magic
Defeat the Air boss
Fly across the chasm
Kill enemy with each weapon
Solve the temple puzzle
Defeat the Water boss
Gain entry to treasure room
Perform a 50-hit combo
Solve the water puzzle
Launch enemy and kill it before it falls on ground
Survive train-cart ride
Block enemy attack
Kill enemy with air combo
Execute an enemy
Destroy 10 enemies using only spirit knives
Defeat the Fire boss
Earn upgrade point and spend it
Find a collectible
Kill enemy with enviromental objects (fire, barrel,...)
Knock enemy off ledge into their falling death
Get your first achievement
Kill enemy with deflected projectile
Complete the game on Hardcore difficulty
Glide for more than 6 seconds
Skip all cutscenes in one play through
Find all collectibles in one play through