Use melee or ranged weapons to take both arms off a living enemy

Find the Outer Way boarding craft

Start a Conquest with all Warchiefs as spies.

Max out all the skills that allow you to level up.

Counter an enemy's attack three times in row.

Earn 150 different medals.

Defeat ten enemies with a stun rod charge attack.

Take down an enemy from 50 meters away with a headshot using the thermal scope.

Complete the entire game on Professional.

Collect all the serpent emblems.

Knock ten enemies off a high place.

Defeat 100 enemies that have come out of a chrysalid.