Collect a Bunny stuffed-animal

Recharge O2

Receive Fire damage

Beat Leshy without taking damage.

Defeat Shamura.

Escape from android combat without taking damage

Kill an Android

Encounter the Alien in Sevastopol for the first time

Complete the second mission

Complete the first mission

Defeat all opponents in Knucklebones.

Unlock all weapons.

Stir a sleeping giant, save the world and reunite with an old friend