No missable achievements (plus 76 unknown)
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Complete any level in single player.
Kill 250 Enemies with a shotgun.
Complete any level in co-op.
Kill 150 Enemies with the Rocket Launcher.
Kill 20 enemies with the Minigun without releasing the trigger.
Kill 200 Enemies with the Thompson Submachine gun.
Rescue professor Stein. So to say.
Kill at least 5 headless kamikazes in one explosion.
Kill 300 Enemies with the Minigun.
Kill 100 Enemies with the Cannon.
Decipher an Egyptian text.
Find at least 30 secrets in single player.
Squash 10 Hatchling spiders.
Kill 200 enemies with the Laser gun.
Secure the bird.
Kill an enemy using the Mutilator.
Find a secret under water.
Defeat the spaceship.
Kill an enemy with a gib torn from another enemy.
Solve the riddle of the Sphynx.
Kill 50 Cucurbitos.
Gib 20 enemies from close range with a shotgun.
Kill 10 enemies with the Chainsaw without releasing the trigger.
Find Sam's classic outfit.
Burn 100 enemies to death.
Kill 100 Kleers with the Cannon.
Kill 20 Harpies with the Sniper rifle.
Remove 10 Gnaar eyes.
Kill a Witch-Bride of Achriman.
Pierce at least 10 enemies with a single cannonball.
Power up the Timelock.
Rip 10 Juvenile spiders apart.
Kill the kicked enemy while it is still in the air.
Complete the South America episode in single player or cooperative.
Kill 100 enemies with Serious Damage active.
Break 5 Arachnoid necks.
Kill 5 Cave Demons while they're in air.
Start the car.
Leap into the unknown on Luxor.
Tear off 10 Kleer heads.
Complete the Persia episode in single player or cooperative.
Rip Scrapjack's head off.
Win a versus match.
Complete the Medieval episode in single player or cooperative.
Smash 20 Kleers with the Sledgehammer.
Rip out 10 Rocketeer hearts.
Complete a level in co-op with blood option set to hippy.
Use the Mutilator to surf after a Werebull.
Kill 3 enemies in one sprint with the Sledgehammer.
Blow a Major Biomechanoid into pieces.
Perform all possible finishing moves in the game.
Break 10 Soldier necks.
Kill at least 30 enemies with a single Serious Bomb.
Kill at least 3 enemies in one spinning Sledgehammer attack.
Frag a total of 100 players.
Destroy an enemy cannon with your own cannon.
Complete the Metropolis level in single player on unmodified serious difficulty.
Finish the Legend of the Beast campaign in single player or cooperative.
Complete the Jewel of The Nile single player campaign.
Earn a gold medal on any level in single player Survival.
Earn a gold medal on any level in cooperative Survival.
Complete TFE, TSE and BFE single player campaigns.
Awake the Guardian of Time.
Complete TFE, TSE and BFE single player campaigns in the estimated time on each level.
Complete TFE, TSE and BFE single player campaigns on unmodified serious difficulty.
Complete TFE, TSE and BFE campaigns in co-op on unmodified serious difficulty.