Here is the full list of all 36 The Last Stand: Aftermath trophies - there are 20 bronze, 10 silver, 5 gold and 1 platinum.
Unlocked all trophies in the game
Complete the tutorial
Reach The Mountains
Reach The Sunken City
Reach Hell
Survive in No Man's Land
Reach Level 10
Reach Level 50
Reach Level 100
Kill a Volunteer
Died 10 times
Trigger a trap, with fatal consequences
Acquire a mutation
Spend Knowledge points to max out a skill upgrade
Kill a Charger
Kill a Spitter
Kill a Leaper
Kill a Burster
Kill a Flamer
Kill an Armored Charger
Kill 1000 Infected
Survive a Horde
Interact with a Supply Cache
Collect 100 Knowledge
Discover the modified HERC device
Open the gates at the HERC checkpoint
Activate the radio tower
Lower the bridge in Leighton City
Complete the main quest line
Complete 5 Runs
Craft an item at a crafting station
Craft 25 items at a crafting stations
Craft an improvised weapon
Purchase an item from the travelling merchant
Collect 25 Supply Bags
Use Antiviral 25 times