Use all the weapons in the game and kill ten enemies with each of them.

Defeat 100 enemies that have come out of a chrysalid.

Complete the entire game on Veteran.

Defeat 20 enemies with the Hydra using a quick shot.

Counter an enemy's attack three times in row.

Pilot the VTOL without getting a scratch on it.

Complete the entire game on Amateur.

Collect all the serpent emblems.

Get through the aircraft carrier's bridge area without being noticed.

Complete Chapter 2 in Ada's campaign.

Complete Chapter 1 in Ada's campaign.

Complete Chapter 4 in Chris' campaign.