Kill 4 enemies with one Slow-mo use.

Headshot 10 enemies with the Sniper Rifle.

Pin 10 enemies to the wall with the Hammerhead.

Complete Mission on any difficulty: Keegan

Kill 10 enemies using combat opportunities.

Collect 50% of the journal intelligence found throughout the game.

Complete Mission on any difficulty: Top

Complete Mission on any difficulty: Replica

Complete Mission on any difficulty: Withdrawal

Complete Mission on any difficulty: Awakening

The player has completed the game without harvesting any Little Sisters

The player has become a Big Daddy