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