Are You Serious?
Complete the game in single player on unmodified serious difficulty.
Bird Hunter
Kill 20 Harpies with the Sniper rifle.
Burn Baby, Burn
Burn 100 enemies to death.
Co-op Beginner
Complete any level in co-op.
Co-op Survivor
Earn a gold medal on any level in cooperative Survival.
Crunchy
Kill 100 Kleers with the Cannon.
Fragger
Frag a total of 100 players.
Look Ma, I won!
Win a versus match.
Look Ma, I'm a Lumberjack!
Look, it's a secret!
Find at least 10 secrets in single player.
Make it count
Kill at least 30 enemies with a single Serious Bomb.
Medieval Master
Complete the Medieval episode in single player or cooperative.
Mine's bigger than yours
Destroy an enemy cannon with your own cannon.
Nice Try
Persia Master
Complete the Persia episode in single player or cooperative.
Rrrrrrrrrr
Kill 10 enemies with the Chainsaw without releasing the trigger.
Serious Beginner
Complete any level in single player.
Serious Damage
Kill 100 enemies with Serious Damage active.
Serious Run
Complete the game in single player by beating the estimated time on each level.
Serious Sam
Complete the game.
South America Master
Complete the South America episode in single player or cooperative.
Space Marine
Kill 200 enemies with the Laser gun.
Survivor
Earn a gold medal on any level in single player Survival.
The Beast
Finish the Legend of the Beast campaign in single player or cooperative.
The Perfect Storm
Treasure Diving
Find a secret under water.
Trick or Treat
Kill 50 Cucurbitos.
Wall of Bullets
Kill 20 enemies with the Minigun without releasing the trigger.