Fully upgrade one weapon in Campaign Mode

Damage the same enemy in Cooperative Mode for 100 kills

Get 5 headshot kills with one Deadeye clip

Finish the game in Easy Mode

Defeat 30 enemies with the M9

Defeat 20 enemies by blind-firing while in cover (without aiming with L1/R1)

Find 20 treasures

Defeat 30 enemies with the KAL 7

Make five enemies drop their grenade by shooting them

Kill Thanatos

Finish Deimos battle

Collect all the Minotaur Horns