Here is the full list of all 30 After the Fall achievements.
Clear Skid Row
Heal yourself with a juice boost
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
Clear Chinatown on Nightmare Difficulty
Clear Union Tower
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
Heal a fellow Runner
Get 100 eliminations with a Pistol
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