There are 2 gamer pictures that can be unlocked while playing.
Unlockable How to Unlock Another picture of the Enemy Get the facemask/100% your armor Picture of an Enemy Beat the First Trantula
Contributed By: Kankui.
Collect all 12 Gold Bars to unlock a secret room. This secret room will be marked on your map and contains golden versions of every weapon.
Contributed By: gibloaf.
Reach certain levels to receive different bonuses. All bonuses are carried over to New Game+ after obtaining the weapon again.
Unlockable How to Unlock Complete Map (including weapon upgrades) Level 20 Health Boost (Permanent collectible-like boost) Level 10 Infinite Foam Ammo Level 30 Infinite Grenade Ammo Level 40 Infinite Rocket Ammo Level 50
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