Complete the Challenge Room.
Complete the game.
Neutralize 10 Malthusians in underwater combat.
Sweep 3 Malthusians off their feet with water.
Collect 50% of the medals.
Kill 2 Malthusians within a timed chain attack.
Kill 5 Mathusians with fire or electricity.
Set 3 Malthusians on fire.
Drown a Malthusian.
Save Chief Billingham.
Complete a hack.
Collect all documents and objects.
Collect all the medals.
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