ACHIEVEMENT - HOW TO UNLOCK Bazookin' - Kill 6 enemies with the bazooka. Big Blimpin' - Kill all penguins stationed on the big zeppelin in Chapter 8 (Single Player). Bird Brained - Brainbug at least one penguin from each of the 7 penguin ranks, including Putzki. Brainbug Fever - Brainbug 30 enemies. Dirigibully - Kill all penguins stationed on the small zeppelin in Chapter 8 (Single Player). Dirty Half-Dozen - Complete the Cooperative game mode. Disgruntled Worker - Find 3 Signs. Door Sentry - Kill 30 Penguins as they step out of a door. Excessive Stacking - Stack all 3 crates near the end of Chapter 11 (Single Player). Fear the Spur - Kill Brno with the knife. Flight Instructor - Juggle an enemy for 10 seconds. For What Reason? - Launch the silo missile. Friendly Transit - Carry the other cooperative player for 500 meters in the same chapter without dying. Hardboiled Orca - Kill 300 penguins or clones. Hardboiled Seal - Kill 100 penguins or clones. High Treason - Brainbug the penguin above the star in Chapter 6 (Single Player). Hindenburger - Kill all penguins stationed on the zeppelin in Chapter 3 (Single Player). Hydrogen Run - Escape the large zeppelin with 40 seconds or more on the timer. Laser Assist - Kill an enemy by knocking him into a laser door. Mission Complete - Overthrow Putzki and liberate Albatropolis. One Shot One Kill - Kill 10 enemies, each with one gunshot. Own Medicine - Kill a helicopter penguin with his own missile. Own Pharmacy - Kill 6 helicopter penguins with their own missiles. Personal Space - Punch or kick 100 times. Rebellious Laborer - Find 20 Signs. Revolutionary Fighter - Find all 45 Signs. Too Many Too Soon - Kill 3 enemies with one grenade. Turncoat - Kill 20 enemies while brainbugging. Two Birds One Stone - Kill 2 enemies with one grenade.