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