Kill 1000 grunts with the musket.
Kill 500 dodgers with the shotgun.
Kill 250 behemoths with the ray gun.
Kill 1000 tanks with the ray gun.
Reach level 20.
Collect 2500 orbs in a single game.
Get a score of 20000
Use a last stand
Get a 10x multiplier
Kill 5000 grunts with the ray gun
Miss 8 times in a row.
Kill 7 enemies during a single cane time.