You need a better Perk is an achievement in the Zombies map Wald des Todes. It requires the players to complete the You need a better Perk minor easter egg.
Cowboy's Can't Shoot Slow... • Major Malfunction • The Streets are Mean • Marshmellow Karma • Give my weapon back! Magma-Rific • Daniel's Echoe • Jerry's Dolls • Team O' Snipes • Grunt-like Takeover The tree is soo big! • Ow, ow, hot potato! • Crushed Ice and Liquid • L.U.N.A.R • I hate it when they lick me The Moon's Shadow • And we have landed! • The Anti-Blotation Beverage • I'm not Coming Home yet • Aether Battle Shin do, Sin'dorei • It's dark, too dark • Zeit Zombie • The L-1 FE Binder • Dark Lament When Edward comes, to kill Hiru upon his throne • That was tad too loud • Hiru's Solution • Tomato Soup • The Dropping Dead • Grunt's Demise • L-1 FE Binder 2.0 • I won't cry in the end of the world • Dawn of Apocalypse • Healthy dose of memories My Sweet Paraphony