Here is the full list of all 26 Dead Maze achievements.
Find out what's threatening Lakeview
Discover a treasure among an infected horde
Build 30 buildings
Reach level 5 Threat
Rescue another player 20 times
Blow up a cafeteria
Meet Jay
Find Egon
Witness an emergency meeting
Craft 30 items
Kill 5 infected only with the explosion of an unstable infected
Equip a protection kit
Find a roommate
Party with other players
Reach level 10
Complete the tutorial
Find a place to settle
Complete 10 Adventures or Expeditions
Reach maximum quality for each type of clothing gear
Complete 30 daily missions
Complete 5 adventures or expeditions in maximum difficulty
Deal with the Outrunner with Jared
Reach level 100
Trigger an elemental combo 30 times
Kill 20 infected Peruvians
Reach level 30