Here is the full list of all 28 Until We Die achievements.
Build a generator
Die from a flower
Kill the flower
Survive the first wave
Survive the second wave
Survive the third wave
Get rank B or higher
Get rank A or higher
Get the S rank
Upgrade the generator to the second level
Upgrade the generator to the third level
Build all workshops
Kill one mutant
Kill 50 mutants
Kill 1000 mutants
Kill 10,000 mutants
Get fuel
Lose stalkers during an expedition to the surface
Pick up the stalkers on the other side of the bridge
Win without losing a single follower
Kill 25 slugs as a hero
Find all notes
Take a ride on a trolley
Fully arm the trolley
Lose on the first day
Earn 0 points
Walk 42,195 meters
Kill 100 mutants