Air Element
Earth Element
Fire Element
Water Element
Huge Pile of Lava
Hey! That's cheating!
Quick Draw
Wall of Bullets
Kill 20 enemies with the Minigun without releasing the trigger.
Cannon Expert
Pierce at least 10 enemies with a single cannonball.
Look, it's a secret!
Find at least 10 secrets in single player.
Leap of Faith
Leap into the unknown on Luxor.
I love my Cannon
Kill 100 Enemies with the Cannon.
I love my Rocket Launcher
Kill 150 Enemies with the Rocket Launcher.
I love my Thompson
Kill 200 Enemies with the Thompson Submachine gun.
I love my Shotguns
Kill 250 Enemies with a shotgun.
I love my Minigun
Kill 300 Enemies with the Minigun.
Serious Beginner
Complete any level in single player.
Serious Sam
Complete the game.
Serious Run
Complete the game in single player by beating the estimated time on each level.
Metropolis King
Complete the Metropolis level in single player on unmodified serious difficulty.
Are You Serious?
Complete the game in single player on unmodified serious difficulty.
Co-op Beginner
Complete any level in co-op.
Co-op Hippy
Complete a level in co-op with blood option set to hippy.
Serious Co-op
Complete the game in co-op on unmodified serious difficulty.
Look Ma, I won!
Win a versus match.
Fragger
Frag a total of 100 players.