Humanity Asset had Steam trading card support added on January 29, 2015. There are 8 cards in the series, 4 of which you'll receive for purchasing and playing the game.
Trading Cards
Foil Cards
Badges
Booster Pack
Emoticons
:Eco:
(common)
(common)
:surprised:
(common)
(common)
:attention:
(common)
(common)
:hi:
(common)
(common)
:killer:
(common)
(common)
:ha:
(common)
(common)
:sentinel:
(uncommon)
(uncommon)
:pod:
(uncommon)
(uncommon)
:newtype:
(rare)
(rare)
Profile Backgrounds
Omega Weapon (Profile Background)
(common)
(common)
Crafticle Carbon (Profile Background)
(common)
(common)
Miroxgun (Profile Background)
(common)
(common)
RXL x44 (Profile Background)
(common)
(common)
Zanac Type2 (Profile Background)
(common)
(common)
PXV Triple (Profile Background)
(uncommon)
(uncommon)
Sonaraxy (Profile Background)
(uncommon)
(uncommon)
Excalibur (Profile Background)
(rare)
(rare)