Defeat 10 enemies in a row, alternating gunplay and hand-to-hand

Defeat 1000 enemies

Gain a 100% completion rank on all missions (difficulty doesn't matter)

Open all of the Secret Doors

Find all of the Keys

Find the Strange Relics

Listen to all optional conversations in game

Play in the ocean near the sunken ship

Kill 50 enemies using nothing but firearms

Defeat 4 enemies with the same explosion (all explosive items and weapons apply)

Find 50 treasures

Complete the game in light mode

Defeat 50 enemies from-the-hip or blind-firing