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