Sever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only)

Collect 100 logs

Kill 50 Necromorphs while they are in Stasis (single player only)

Upgrade 1 Weapon completely

Defeat the AI

Find the Peng treasure

Kill a Brute without taking damage

Kill 4 enemies with the same Ripper blade

Kill a Cyst by catching its Mine and throwing it back

Use a paper airplane.

Kill 25 crawling enemies with Stomp (single player only)

Score 10,000 points.

Use the dynamite.