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