Fireworks
Using explosive weapons, kill 10 people in a row.
Afterlife
Kill an enemy player while you're dead.
Road runner
In a match of at least 6 players, run 2 kilometers without getting killed.
Serious Killer
Kill 500 people.
Stuff of Legends
Find the XL4P Beam Gun outside of Bright Island.
The Good, the Bad and the Enormous
Finish The First Encounter on single player.
Friendly First Encounter
Finish The First Encounter in cooperative.
The Second Encounter
Finish The Second Encounter on single player.
Friendly Second Encounter
Finish The Second Encounter in cooperative.
A message to the stars
Find the rising obelisk.
The talk of parties
Defeat the giant lava golem.
Forth to the past
Complete the first Egypt level.
Change of scenery
Find Moon Mountains.
Bouncy Survival
Find a secret bouncing rock.
Sam I Am
Kill 100.001 enemies.
Damager
Deal a total of 1 million damage to enemies.
There used to be an alligator pit here
Unfortunately, we don't have the right model for it, so this'll do.
Newton's worst enemy
Mess with the gravity for a total of 60 minutes.
Stop jumping!
Kill 5000 marsh-hoppers with the chainsaw.
Too Serious for weapons
Complete a level in The Second Encounter using only the knife on at least normal difficulty.
There can be only one!
Kill the Highlander in Valley of the Kings.
With our powers combined
All Elementals acquired.
Yes, I'd like to kill more monsters
Find Sacred Yards.
No Fridge to Hide
Obtain the Crystal Skull.
Going with the Wind
Kill the boss and complete the South America episode.
Once Upon a Time in Babylon
Kill the boss and complete the Persia episode.
Million Funerals and No Wedding
Kill the boss and complete the Medieval episode.
Guns are seriously useless
Finish 2 levels in The Second Encounter using only the knife in at least normal difficulty.
Who needs kills, anyway?
Kill less than 8 enemies on the first level of The Second Encounter in at least normal difficulty.
That all you got?
Finish the first level of The Second Encounter taking no damage in at least normal difficulty.
Jumping is overrated
Finish the first level of The Second Encounter without jumping in at least normal difficulty.
Impossible
This achievement is impossible to get.
Mine Trap
Kill 100 monsters with mines.
Friendly Mine Trap
Kill 50 players with mines.
Plasma King
Find a secret Plasmathrower in The Second Encounter.
Secret Detonator
Find a secret Minelayer in The Second Encounter.
I am Ugh-Zan
In singleplayer, beat the last level of The First Encounter or the last level in The Second Encounter in the "I am Ugh-Zan" difficulty.
Christmas 2014
Get the gold medal on the Christmas 2014 survival level.
Familiar Scenery
Find Bright Island's first secret level.
Not Quite A Resort
Find Bright Island's second secret level.
Bright Island
Finish the Bright Island campaign in single player.
Friendly Bright Island
Finish the Bright Island campaign in cooperative.