Rocketbirds: Hardboiled Chicken

At the start of Chapter 7, "Hideout", move to the right. You will be asked to get a box of grenades on the upper level. From there, move to the right and toss a grenade at the sentry waiting outside the door ahead. An unlimited number of penguins will spawn. You have an unlimited supply of grenades. Throw 30 grenades at them.
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Find all 45 hidden signs to unlock the knife. Replay Chapter 15 and face Brno again. Using the knife will make the fight easier. You can now attack past his shield and knock him down, and can also shoot him as usual. Make sure the killing blow is done with the knife.

Your twenty kills must be done during the same playthrough on a single saved game file. You cannot replay individual chapters. When progressing through the game normally, kill most of the soldiers while hijacking a brainbugged penguin to earn it near the end of the game.

Complete the following tasks to unlock Vita trophy rewards.

Complete the following tasks to unlock PlayStation trophy rewards.

Platinum Trophy (Platinum): Collect all trophies.

Mission Complete (Gold): Overthrow Putzki and liberate Albatropolis.

Dirty Half-Dozen (Gold): Complete the Cooperative game mode.

Hardboiled Seal (Bronze): Kill 100 penguins or clones.

Hardboiled Orca (Gold): Kill 300 penguins or clones.

Disgruntled Worker (Bronze): Find 3 Signs.

Rebellious Laborer (Silver): Find 20 Signs.

Revolutionary Fighter (Gold): Find all 45 Signs.

Flight Instructor (Bronze): Juggle an enemy for 10 seconds (Single Player).

Own Medicine (Bronze): Kill a helicopter penguin with his own missile.

Own Pharmacy (Silver): Kill 6 helicopter penguins with their own missiles.

Hydrogen Run (Silver): Escape the large zeppelin with 40 seconds or more on the timer.

Door Sentry (Bronze): Kill 30 Penguins as they step out of a door.

Brainbug Fever (Bronze): Brainbug 30 enemies.

High Treason (Bronze): Brainbug the penguin above the star in Chapter 6 (Single Player).

Turncoat (Bronze): Kill 20 enemies while brainbugging.

Bird Brained (Gold): Brainbug at least one penguin from each of the 7 penguin ranks, including Putzki.

Riding the Thunderbolt (Gold): Kill Mega-Brno in Hardboiled mode .

Two Birds One Stone (Bronze): Kill 2 enemies with one grenade.

Too Many Too Soon (Silver): Kill 3 enemies with one grenade.

Bazookin' (Bronze): Kill 6 enemies with the bazooka.

Putzki Monologues (Bronze): Find all four episodes of Putzki on TV in a single playthrough .

For What Reason? (Bronze): Launch the silo missile.

Method Acting (Bronze): Kill yourself as an Elite Penguin on Palace TV in Chapter 13 .

One Shot One Kill (Silver): Kill 10 enemies, each with one gunshot.

Laser Assist (Bronze): Kill an enemy by knocking him into a laser door.

Excessive Stacking (Bronze): Stack all 3 crates near the end of Chapter 11 (Single Player).

Hindenburger (Bronze): Kill all penguins stationed on the zeppelin in Chapter 3 (Single Player).

Dirigibully (Bronze): Kill all penguins stationed on the small zeppelin in Chapter 8 (Single Player).

Big Blimpin' (Silver): Kill all penguins stationed on the big zeppelin in Chapter 8 (Single Player).