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