Here is the full list of all 31 Deadlight achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Finish the Nightmare mode
Beat the high score in Madness Mansion
Beat the high score in Sport Daisy
Roll to avoid lethal fall damage
Find all of Randall's memories
Find all the IDs
Get 100% of Deadlight
Beat the high score in Raven Thunder's Rock Legend
Make it to the end
Finish Randall's flashback
Reunite with Stella
Finish Randall's nightmare
Find the first health expander
Find Parker in the hockey arena
Push a zombie over a railing
Face someone from Randall's past in the Park
Get infected by a friend on the leaderboards
Kill an enemy with a single melee attack
Follow the Ratman to his den
Finish Randall's dream
Tackle an enemy
Perform a headshot
Reload the revolver really fast
Get to the military control
Perform a combo on an enemy
Execute an enemy
Reach the junkyard
Survive a close encounter
Tackle a door
Escape from the warehouse
Find a page of Randall's journal