Successfully Counter all of a Brute's Damage-Giving Attacks

Kill 20 Enemies with Gunfire While Hanging

Kill 20 Enemies by Shooting from the Hip (without aiming)

Defeat 20 Enemies by Blind-Firing While in Cover (without aiming)

Explore Photo Mode

Kill 30 Enemies with the KAL-7

Kill 5 Enemies in a Row with Headshots

Find the Strange Relic

Do hard time.

Earn 26 Gems.

Earn 13 Gems.

Defeat N. Cortex.

Earn the Key in Jaws of Darkness.