Here is the full list of all 30 After the Fall achievements.
Clear Union Tower
Heal a fellow Runner
Clear Chinatown
Heal yourself with a juice boost
Get 100 eliminations with a Pistol
Clear Skid Row
Eliminate a total of 100 Snowbreed
Make it to The Line
Eliminate a total of 10 Snowbreed
Eliminate your first Snowbreed as a Runner
Clear Skid Row on Nightmare Difficulty
Clear Quarantine Center
Clear Quarantine Center on Nightmare Difficulty
Clear Chinatown on Nightmare Difficulty
Clear Union Tower on Nightmare Difficulty
Re-activated the Relay tower
Win a Tundradome match
Lose Tundradome match
Eliminate a total of 1000 Snowbreed
Eliminate a total of 10000 Snowbreed
Eliminate a total of 53600 Snowbreed
Collect 10,000 Harvest
Collect 100,000 Harvest
Collect 500,000 Harvest
Get 100 eliminations with an Arizona Falcon
Get 100 eliminations with a Shotgun
Get 100 eliminations with an SMG
Get 100 eliminations with the Assault Carbine
Get 100 eliminations with the MT47
Get 20 consecutive critical hits in a row