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.
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
Finish Randall's nightmare
Find Parker in the hockey arena
Beat the high score in Sport Daisy
Face someone from Randall's past in the Park
Roll to avoid lethal fall damage
Follow the Ratman to his den
Finish Randall's dream
Push a zombie over a railing
Get infected by a friend on the leaderboards
Perform a headshot
Reload the revolver really fast
Get to the military control
Tackle an enemy
Kill an enemy with a single melee attack
Find the first health expander
Reach the junkyard
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