Overthrow Putzki and liberate Albatropolis

Complete the Cooperative game mode

Kill 100 penguins or clones

Kill 300 penguins or clones

Find 3 Signs

Find 20 Signs

Find all 45 Signs

Juggle an enemy for 10 seconds

Kill a helicopter penguin with his own missile

Kill 6 helicopter penguins with their own missiles

Escape the large zeppelin with 40 seconds or more on the timer

Kill 30 Penguins as they step out of a door

Brainbug 30 enemies

Brainbug the penguin above the star in Chapter 6 (Single Player)

Kill 20 enemies while brainbugging

Brainbug at least one penguin from each of the 7 penguin ranks, including Putzki

Kill Brno with the knife

Kill 2 enemies with one grenade

Kill 3 enemies with one grenade

Kill 6 enemies with the bazooka

Carry the other cooperative player for 500 meters in the same chapter without dying

Launch the silo missile

Punch or kick 100 times

Kill 10 enemies, each with one gunshot

Kill an enemy by knocking him into a laser door

Stack all 3 crates near the end of Chapter 11 (Single Player)

Kill all penguins stationed on the zeppelin in Chapter 3 (Single Player)

Kill all penguins stationed on the small zeppelin in Chapter 8 (Single Player)

Kill all penguins stationed on the big zeppelin in Chapter 8 (Single Player)