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