Throw Back a Grenade and Defeat 2 Enemies at Once

Kill 100 Enemies with Headshots

Complete Acis

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

Kill 30 Enemies with the Mk-NDI

Kill 30 Enemies with the G-MAL

Save a human from an Abductor's beam

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

Defeat 20 Enemies with Hand-to-Hand Combat

Finish the Game on Easy Without Changing the Difficulty

Kill 50 Enemies with the Dragon Sniper

You stole an experimental super weapon from Merryweather... and gave it back.

Kill 30 Enemies with the Desert-5