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