Here is the full list of all 20 Afterfall: Reconquest Episode I achievements.
Kill 100 enemies using a machine gun
Kill 50 enemies using a melee attack
Get maximum level at Drain skill
Finish the game
Get maximum level at Shield skill
Get maximum level at Shrapnel skill
Using explosives, kill 15 enemies at once
Barely survive the combat
Find all loos at Gyula Creek
Kill 3 enemies with one Shrapnel's shot
Use Shield to absorb damage that would kill you 9 times
Kill 12 enemies with a bounced Shrapnel's bullet
Get killed by a train
Get 7 lives by draining the enemies
Get 25 headshot kills while using a Shield
Get killed by a lake
Do 40 rolls
Finish all available quests
Find all secret locations
Go through all the stairs at the Gate