3 consecutive Bulls-eyes in the Shuffleboard mini-game.

Complete the Army of the Dead mission

Complete the Larry Get Your Gun mission

Meet every principle character in the game

Defeat 200 enemies with the GAU - 19

Defeat ten enemies in a row with a single punch, after softening them up with gunfire

Defeat 30 enemies with the RPG - 7

Defeat 70 enemies with the SAS - 12

Defeat 30 enemies with the Wes - 44

Finish the game in Normal Mode

Find all 100 treasures

Defeat 250 enemies with headshots