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