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