Fireworks
Not unlocked yetUsing explosive weapons, kill 10 people in a row.
Afterlife
Not unlocked yetKill an enemy player while you're dead.
Road runner
Not unlocked yetIn a match of at least 6 players, run 2 kilometers without getting killed.
Serious Killer
Not unlocked yetKill 500 people.
Stuff of Legends
Not unlocked yetFind the XL4P Beam Gun outside of Bright Island.
The Good, the Bad and the Enormous
Not unlocked yetFinish The First Encounter on single player.
Friendly First Encounter
Not unlocked yetFinish The First Encounter in cooperative.
The Second Encounter
Not unlocked yetFinish The Second Encounter on single player.
Friendly Second Encounter
Not unlocked yetFinish The Second Encounter in cooperative.
A message to the stars
Not unlocked yetFind the rising obelisk.
The talk of parties
Not unlocked yetDefeat the giant lava golem.
Forth to the past
Not unlocked yetComplete the first Egypt level.
Change of scenery
Not unlocked yetFind Moon Mountains.
Bouncy Survival
Not unlocked yetFind a secret bouncing rock.
Sam I Am
Not unlocked yetKill 100.001 enemies.
Damager
Not unlocked yetDeal a total of 1 million damage to enemies.
There used to be an alligator pit here
Not unlocked yetUnfortunately, we don't have the right model for it, so this'll do.
Newton's worst enemy
Not unlocked yetMess with the gravity for a total of 60 minutes.
Stop jumping!
Not unlocked yetKill 5000 marsh-hoppers with the chainsaw.
Too Serious for weapons
Not unlocked yetComplete a level in The Second Encounter using only the knife on at least normal difficulty.
There can be only one!
Not unlocked yetKill the Highlander in Valley of the Kings.
With our powers combined
Not unlocked yetAll Elementals acquired.
Yes, I'd like to kill more monsters
Not unlocked yetFind Sacred Yards.
No Fridge to Hide
Not unlocked yetObtain the Crystal Skull.