Here is the full list of all 30 Deadlight achievements worth 400 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox 360.
Find the first health expander
Follow the Ratman to his den
Get infected by a friend on the leaderboards
Finish Randall's dream
Tackle an enemy
Reload the revolver really fast
Perform a headshot
Get to the military control
Kill an enemy with a single melee attack
Perform a combo on an enemy
Reach the junkyard
Execute an enemy
Survive a close encounter
Tackle a door
Escape from the warehouse
Find a page of Randall's journal
Finish Randall's nightmare
Finish Randall's flashback
Face someone from Randall's past in the Park
Make it to the end
Get 100% of Deadlight
Roll to avoid lethal fall damage
Push a zombie over a railing
Beat the high score in Raven Thunder's Rock Legend
Beat the high score in Sport Daisy
Beat the high score in Madness Mansion
Find Parker in the hockey arena
Reunite with Stella
Find all of Randall's memories
Find all the IDs