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