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