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